char = D;code = 68
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = D;code = 68
char = 2;code = 50
char = -;code = 45
char = l;code = 108
char = i;code = 105
char = k;code = 107
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = m;code = 109
char = b;code = 98
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = .;code = 46
result sql = Dopamine D2-like receptor in the nucleus accumbens is involved in the antinociceptive effect of nitrous oxide.
Dopamine D2-like receptor in the nucleus accumbens is involved in the antinociceptive effect of nitrous oxide.
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = B;code = 66
char = A;code = 65
char = C;code = 67
char = K;code = 75
char = G;code = 71
char = R;code = 82
char = O;code = 79
char = U;code = 85
char = N;code = 78
char = D;code = 68
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = s;code = 115
char = m;code = 109
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = N;code = 78
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = );code = 41
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = .;code = 46
char = ;code = 32
char = O;code = 79
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = u;code = 117
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = p;code = 112
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = p;code = 112
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = N;code = 78
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = M;code = 77
char = E;code = 69
char = T;code = 84
char = H;code = 72
char = O;code = 79
char = D;code = 68
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = A;code = 65
char = d;code = 100
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = F;code = 70
char = i;code = 105
char = s;code = 115
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = o;code = 111
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = N;code = 78
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = ,;code = 44
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = z;code = 122
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = g;code = 103
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 7;code = 55
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = N;code = 78
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = u;code = 117
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = -;code = 45
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = -;code = 45
char = F;code = 70
char = o;code = 111
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = f;code = 102
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = p;code = 112
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char = o;code = 111
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char = O;code = 79
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char = s;code = 115
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char = r;code = 114
char = a;code = 97
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char = l;code = 108
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char = d;code = 100
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char = -;code = 45
char = l;code = 108
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char = k;code = 107
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char = r;code = 114
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char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
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char = a;code = 97
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char = t;code = 116
char = a;code = 97
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char = w;code = 119
char = a;code = 97
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char = i;code = 105
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char = j;code = 106
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char = e;code = 101
char = d;code = 100
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char = i;code = 105
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char = t;code = 116
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char = n;code = 110
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char = l;code = 108
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char = s;code = 115
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char = a;code = 97
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = m;code = 109
char = b;code = 98
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char = s;code = 115
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char = (;code = 40
char = N;code = 78
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char = c;code = 99
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char = ;code = 32
char = s;code = 115
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char = e;code = 101
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char = l;code = 108
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char = .;code = 46
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char = A;code = 65
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
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char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 2;code = 50
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = y;code = 121
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char = e;code = 101
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char = 7;code = 55
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char = %;code = 37
char = ;code = 32
char = n;code = 110
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char = t;code = 116
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char = e;code = 101
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char = o;code = 111
char = r;code = 114
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char = 2;code = 50
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char = %;code = 37
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = y;code = 121
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char = e;code = 101
char = n;code = 110
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char = 7;code = 55
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = N;code = 78
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 3;code = 51
char = 0;code = 48
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char = m;code = 109
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char = n;code = 110
char = ,;code = 44
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char = r;code = 114
char = a;code = 97
char = t;code = 116
char = s;code = 115
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char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
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char = s;code = 115
char = u;code = 117
char = b;code = 98
char = j;code = 106
char = e;code = 101
char = c;code = 99
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char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = o;code = 111
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char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = a;code = 97
char = l;code = 108
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char = t;code = 116
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char = a;code = 97
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char = w;code = 119
char = a;code = 97
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char = e;code = 101
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char = d;code = 100
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char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
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char = o;code = 111
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char = i;code = 105
char = s;code = 115
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char = o;code = 111
char = c;code = 99
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char = e;code = 101
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char = c;code = 99
char = a;code = 97
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char = l;code = 108
char = y;code = 121
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char = >;code = 62
char = <;code = 60
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char = r;code = 114
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char = >;code = 62
char = <;code = 60
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char = >;code = 62
char = R;code = 82
char = E;code = 69
char = S;code = 83
char = U;code = 85
char = L;code = 76
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
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char = >;code = 62
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char = x;code = 120
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char = o;code = 111
char = s;code = 115
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char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = 7;code = 55
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = N;code = 78
char = (;code = 40
char = 2;code = 50
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char = O;code = 79
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char = i;code = 105
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char = e;code = 101
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char = R;code = 82
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char = o;code = 111
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char = t;code = 116
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char = e;code = 101
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char = N;code = 78
char = A;code = 65
char = c;code = 99
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char = s;code = 115
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char = e;code = 101
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char = f;code = 102
char = e;code = 101
char = c;code = 99
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char = o;code = 111
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char = ;code = 32
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char = O;code = 79
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char = e;code = 101
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char = C;code = 67
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char = S;code = 83
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char = :;code = 58
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char = e;code = 101
char = c;code = 99
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char = o;code = 111
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char = -;code = 45
char = l;code = 108
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char = k;code = 107
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char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = N;code = 78
char = A;code = 65
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
result sql = BACKGROUND : The mechanism of the antinociceptive effects of nitrous oxide (N(2)O) has not been completely elucidated. On the other hand, numerous studies have indicated that mesolimbic dopaminergic neurons, which are thought to be involved in rewarding and reinforcement processes, play important roles in the supraspinal pain-suppression system. We hypothesized that the mesolimbic dopaminergic system is involved in the antinociceptive effect of N(2)O.

METHODS : Adult male Fischer rats were used in this study. To examine whether the dopaminergic system is activated by N(2)O, frozen sections of the ventral tegmental area of rats exposed to 75% N(2)O were double-stained for c-Fos and tyrosine hydroxylase. To clarify whether the dopaminergic system is involved in the antinociceptive action of N(2)O, saline or raclopride, a dopamine D(2)-like receptor antagonist, was injected into the nucleus accumbens (NAc) shell region. After exposure to 25% oxygen-75% nitrogen or 25% oxygen-75% N(2)O for 30 min, rats were subjected to formalin test, and the spinal cord was examined immunohistochemically.

RESULTS : Exposure to 75% N(2)O increased c-Fos expression in tyrosine hydroxylase-positive cells in the ventral tegmental area. Raclopride, injected into the NAc shell region, attenuated the antinociceptive effect of N(2)O in the formalin test, and blocked the suppressive effect of N(2)O on the formalin-induced c-Fos expression in the dorsal horn of the spinal cord by N(2)O.

CONCLUSION : It is possible that inhalation of N(2)O activates mesolimbic dopaminergic neurons, and that the antinociceptive effect of N(2)O is at least partially mediated by dopamine D(2)-like receptors in the NAc shell region.

Publication: Anesth. Analg. 2008 Jun ;106(6)::1904-9. :doi: 10.1213/ane.0b013e318172b15b.
Publication Date: 2008 Jun
Study Author(s): Koyanagi, Sahoko;Himukashi, Shugaku;Mukaida, Kumiko;Shichino, Tsutomu;Fukuda, Kazuhiko;
Institution: Department of Anesthesia, Kyoto University Hospital, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan. [email protected]
Shortcut link to this study:
BACKGROUND : The mechanism of the antinociceptive effects of nitrous oxide (N(2)O) has not been completely elucidated. On the other hand, numerous studies have indicated that mesolimbic dopaminergic neurons, which are thought to be involved in rewarding and reinforcement processes, play important roles in the supraspinal pain-suppression system. We hypothesized that the mesolimbic dopaminergic system is involved in the antinociceptive effect of N(2)O.

METHODS : Adult male Fischer rats were used in this study. To examine whether the dopaminergic system is activated by N(2)O, frozen sections of the ventral tegmental area of rats exposed to 75% N(2)O were double-stained for c-Fos and tyrosine hydroxylase. To clarify whether the dopaminergic system is involved in the antinociceptive action of N(2)O, saline or raclopride, a dopamine D(2)-like receptor antagonist, was injected into the nucleus accumbens (NAc) shell region. After exposure to 25% oxygen-75% nitrogen or 25% oxygen-75% N(2)O for 30 min, rats were subjected to formalin test, and the spinal cord was examined immunohistochemically.

RESULTS : Exposure to 75% N(2)O increased c-Fos expression in tyrosine hydroxylase-positive cells in the ventral tegmental area. Raclopride, injected into the NAc shell region, attenuated the antinociceptive effect of N(2)O in the formalin test, and blocked the suppressive effect of N(2)O on the formalin-induced c-Fos expression in the dorsal horn of the spinal cord by N(2)O.

CONCLUSION : It is possible that inhalation of N(2)O activates mesolimbic dopaminergic neurons, and that the antinociceptive effect of N(2)O is at least partially mediated by dopamine D(2)-like receptors in the NAc shell region.
PMID: 18499630

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