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Vasopressin (VP), oxytocin (OXT) and vasoactive intestinal polypeptide (VIP) in the brain modulate physiological and behavioral processes in many vertebrates. Day-active tree shrews, the closest relatives of primates, live singly or in pairs in territories that they defend vigorously against intruding conspecifics. However, anatomy concerning peptidergic neuron distribution in the tree shrew brain...
In an earlier study we found more than twice as many vasopressin (AVP) neurons in the suprachiasmatic nucleus (SCN) of homosexual men as compared to heterosexual men. The present measurements in the same individuals showed that there is no difference in the number of vasoactive intestinal polypeptide (VIP)-expressing neurons in the SCN. The reduced nuclear diameter of both VIP and AVP neurons in...
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