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char = c;code = 99
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char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = o;code = 111
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char = ;code = 32
char = A;code = 65
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char = m;code = 109
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char = t;code = 116
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char = c;code = 99
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char = c;code = 99
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char = d;code = 100
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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 = e;code = 101
char = x;code = 120
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = g;code = 103
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = d;code = 100
char = o;code = 111
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = e;code = 101
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 = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = s;code = 115
char = .;code = 46
result sql = Activation of A-type gamma-amino butyric acid receptors excites gonadotrophin-releasing hormone neurones isolated from adult rats.
Activation of A-type gamma-amino butyric acid receptors excites gonadotrophin-releasing hormone neurones isolated from adult rats.
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char = d;code = 100
char = o;code = 111
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char = o;code = 111
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = -;code = 45
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char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = o;code = 111
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char = e;code = 101
char = ;code = 32
char = (;code = 40
char = G;code = 71
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char = R;code = 82
char = H;code = 72
char = );code = 41
char = ;code = 32
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char = u;code = 117
char = r;code = 114
char = o;code = 111
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char = ;code = 32
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char = p;code = 112
char = r;code = 114
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char = e;code = 101
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char = f;code = 102
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char = m;code = 109
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char = m;code = 109
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char = c;code = 99
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char = A;code = 65
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char = G;code = 71
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char = R;code = 82
char = H;code = 72
char = ;code = 32
char = n;code = 110
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char = A;code = 65
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char = b;code = 98
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char = G;code = 71
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char = A;code = 65
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char = G;code = 71
char = A;code = 65
char = B;code = 66
char = A;code = 65
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char = A;code = 65
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char = .;code = 46
char = ;code = 32
char = T;code = 84
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char = ;code = 32
char = G;code = 71
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char = A;code = 65
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char = G;code = 71
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char = H;code = 72
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char = A;code = 65
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char = A;code = 65
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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 = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = G;code = 71
char = A;code = 65
char = B;code = 66
char = A;code = 65
char = (;code = 40
char = A;code = 65
char = );code = 41
char = R;code = 82
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = c;code = 99
char = h;code = 104
char = -;code = 45
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = n;code = 110
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = -;code = 45
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
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 = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
char = -;code = 45
char = e;code = 101
char = n;code = 110
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = c;code = 99
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 = t;code = 116
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = -;code = 45
char = 2;code = 50
char = 6;code = 54
char = ;code = 32
char = +;code = 43
char = /;code = 47
char = -;code = 45
char = ;code = 32
char = 1;code = 49
char = .;code = 46
char = 4;code = 52
char = ;code = 32
char = m;code = 109
char = V;code = 86
char = ;code = 32
char = (;code = 40
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = +;code = 43
char = /;code = 47
char = -;code = 45
char = ;code = 32
char = S;code = 83
char = E;code = 69
char = M;code = 77
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 4;code = 52
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
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 = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = t;code = 116
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = -;code = 45
char = 5;code = 53
char = 7;code = 55
char = ;code = 32
char = +;code = 43
char = /;code = 47
char = -;code = 45
char = ;code = 32
char = 2;code = 50
char = .;code = 46
char = 7;code = 55
char = ;code = 32
char = m;code = 109
char = V;code = 86
char = ;code = 32
char = (;code = 40
char = n;code = 110
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 3;code = 51
char = 4;code = 52
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
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 = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = G;code = 71
char = A;code = 65
char = B;code = 66
char = A;code = 65
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = p;code = 112
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
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 = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = -;code = 45
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = G;code = 71
char = A;code = 65
char = B;code = 66
char = A;code = 65
char = (;code = 40
char = A;code = 65
char = );code = 41
char = R;code = 82
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
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 = e;code = 101
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 = a;code = 97
char = u;code = 117
char = g;code = 103
char = m;code = 109
char = e;code = 101
char = n;code = 110
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 = 110
char = e;code = 101
char = u;code = 117
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = o;code = 111
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 3;code = 51
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = ,;code = 44
char = 2;code = 50
char = 1;code = 49
char = -;code = 45
char = d;code = 100
char = i;code = 105
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 = -;code = 45
char = 5;code = 53
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = -;code = 45
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = -;code = 45
char = 2;code = 50
char = 0;code = 48
char = -;code = 45
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = x;code = 120
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 = p;code = 112
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = G;code = 71
char = A;code = 65
char = B;code = 66
char = A;code = 65
char = (;code = 40
char = A;code = 65
char = );code = 41
char = R;code = 82
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = R;code = 82
char = N;code = 78
char = A;code = 65
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 = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = i;code = 105
char = -;code = 45
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = c;code = 99
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = -;code = 45
char = p;code = 112
char = o;code = 111
char = l;code = 108
char = y;code = 121
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = a;code = 97
char = l;code = 108
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 = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = ;code = 32
char = 3;code = 51
char = ,;code = 44
char = ;code = 32
char = g;code = 103
char = a;code = 97
char = m;code = 109
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = a;code = 97
char = m;code = 109
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = 2;code = 50
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = u;code = 117
char = n;code = 110
char = i;code = 105
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 = d;code = 100
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = ;code = 32
char = 6;code = 54
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = a;code = 97
char = m;code = 109
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = 3;code = 51
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = u;code = 117
char = n;code = 110
char = i;code = 105
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 = n;code = 110
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = G;code = 71
char = n;code = 110
char = R;code = 82
char = H;code = 72
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 = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
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char = ;code = 32
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char = ;code = 32
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char = ;code = 32
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char = t;code = 116
char = e;code = 101
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char = i;code = 105
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char = f;code = 102
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char = n;code = 110
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char = e;code = 101
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char = l;code = 108
char = ;code = 32
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char = i;code = 105
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char = ;code = 32
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char = f;code = 102
char = ;code = 32
char = G;code = 71
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char = ;code = 32
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char = e;code = 101
char = u;code = 117
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result sql = Gonadotrophin-releasing hormone (GnRH) neurones represent the final output neurones in the neuroendocrine control of reproduction, and gamma-amino butyric acid (GABA) is one of the major players in the regulation of GnRH neurones GABA : inhibits a large proportion of brain neurones in adult animals by acting on A-type GABA receptors (GABA(A)Rs). Two contradictory reports on the action of GABA in the GnRH neurones of adult mice have been published. DeFazio et al. (Mol Endocrinol 2002; 16: 2872) demonstrated that activation of GABA(A)Rs excites the GnRH neurones of adult mice, whereas Han et al. (Endocrinology 2002; 143: 1459) showed that the response to GABA on GnRH neurones switches from depolarisation to hyperpolarisation around puberty in female mice. Therefore, we examined the reversal potential of GABA(A)R currents by means of perforated patch-clamp recording with gramicidin in overnight-cultured GnRH neurones isolated from adult GnRH-enhanced green fluorescent protein transgenic rats. The reversal potential was -26 +/- 1.4 mV (mean +/- SEM, n = 42) in GnRH neurones, whereas it was -57 +/- 2.7 mV (n = 34) in unidentified neurones, and GABA depolarised the GnRH neurones in current-clamp condition. The GABA(A)R currents in rat GnRH neurones were augmented by neurosteroids, allopregnanolone and 3 alpha,21-dihydroxy-5 alpha-pregnan-20-one, at submicromolar concentrations. In addition, the expression patterns of GABA(A)R subunit mRNAs were determined by multi-cell reverse transcription-polymerase chain reaction, which revealed that the alpha2, beta 3, gamma 1 and gamma 2 subunits were dominant and the alpha 6 and gamma 3 subunits were negative in rat GnRH neurones. These results indicate that GABA(A)Rs in the soma of rat GnRH neurones are comprised mainly of alpha2, beta 3 and gamma 1 or gamma 2 subunits and that they are sensitive to neurosteroids; moreover, they suggest that activation of these receptors depolarises GnRH neurones. Thus, GABA and neurosteroids influence the electrical activity of GnRH neurones.

Publication: J. Neuroendocrinol. 2008 May ;20(5)::566-75. :doi: 10.1111/j.1365-2826.2008.01697.x.
Publication Date: 2008 May
Study Author(s): Yin, C;Ishii, H;Tanaka, N;Sakuma, Y;Kato, M;
Institution: Department of Physiology, Nippon Medical School, Tokyo, Japan.
Shortcut link to this study:
Gonadotrophin-releasing hormone (GnRH) neurones represent the final output neurones in the neuroendocrine control of reproduction, and gamma-amino butyric acid (GABA) is one of the major players in the regulation of GnRH neurones GABA : inhibits a large proportion of brain neurones in adult animals by acting on A-type GABA receptors (GABA(A)Rs). Two contradictory reports on the action of GABA in the GnRH neurones of adult mice have been published. DeFazio et al. (Mol Endocrinol 2002; 16: 2872) demonstrated that activation of GABA(A)Rs excites the GnRH neurones of adult mice, whereas Han et al. (Endocrinology 2002; 143: 1459) showed that the response to GABA on GnRH neurones switches from depolarisation to hyperpolarisation around puberty in female mice. Therefore, we examined the reversal potential of GABA(A)R currents by means of perforated patch-clamp recording with gramicidin in overnight-cultured GnRH neurones isolated from adult GnRH-enhanced green fluorescent protein transgenic rats. The reversal potential was -26 +/- 1.4 mV (mean +/- SEM, n = 42) in GnRH neurones, whereas it was -57 +/- 2.7 mV (n = 34) in unidentified neurones, and GABA depolarised the GnRH neurones in current-clamp condition. The GABA(A)R currents in rat GnRH neurones were augmented by neurosteroids, allopregnanolone and 3 alpha,21-dihydroxy-5 alpha-pregnan-20-one, at submicromolar concentrations. In addition, the expression patterns of GABA(A)R subunit mRNAs were determined by multi-cell reverse transcription-polymerase chain reaction, which revealed that the alpha2, beta 3, gamma 1 and gamma 2 subunits were dominant and the alpha 6 and gamma 3 subunits were negative in rat GnRH neurones. These results indicate that GABA(A)Rs in the soma of rat GnRH neurones are comprised mainly of alpha2, beta 3 and gamma 1 or gamma 2 subunits and that they are sensitive to neurosteroids; moreover, they suggest that activation of these receptors depolarises GnRH neurones. Thus, GABA and neurosteroids influence the electrical activity of GnRH neurones.
PMID: 18363808

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