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Serotonin and endocrine rhythms.

The biological rhythms belong partly to the genetic patrimony and partly to the environmental patterns. The main results have been obtained on the hormonal fluctuations which are mostly controlled by the hypothalamopituitary system. Thus they include modulations of neurotransmitters activity especially serotonin. Experimental facts have been gathered in different species for ACTH, growth hormone, prolactin TSH and gonadotropins rhythms. These phenomenona are integrated in a general organization which includes sleep-waking cycle.