The brain gland epiphysis, participated in the regulation of the endocrine functions of mammals, is rudimentary third eye of lower vertebrates. In the process of evolution the gland has lost it own photoreceptor functions, but saved very close contacts with visual system. By means of it biologically active combinations and, first of all, melatonin hormone, the epiphysis support control over transmission of visual information and participate in realization of biological effects of light on organism.
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