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In experiments on Wistar mature male rats, we studied the effects of injections of corticotropin (ACTH; single or five daily introductions, 1 U per day) on metabolism of epiphyseal serotonin. Injections of ACTH intensified the process of formation of a night-time peak of melatonin synthesis in the epiphysis at the expense of enhancement of utilization of tryptophan by pinealocytes and its subsequent...
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