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The effect of salmon gonadotropin(s) (SG) on cyclic AMP (cAMP) levels in immature trout gonadal tissue of both sexes was measured by radioimmunoassay. 2. A dose-response line was obtained to SG in gonads of both male and female trout. 3. As little as 0.45 SG units (1 SG unit = 1 mug NIH-LH-S18 in the chick bioassay) significantly increased cAMP formation in the presence of 8 mM theophylline; mammalian LH, FSH, LTH, ACTH, TSH and HCG were inactive. 4. The assay for SG was investigated with respect to time of incubation and two phosphodiesterase inhibitors; some conditions for the cAMP radioimmunoassay (cAMP-RIA) were compared.
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Idler et al. (1975) studied this question.
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