Abstract
Vasopressin (VP) is axonally distributed in many brain structures, including the ventral hippocampus. Picogram quantities of VP injected into the hippocampus improve the passive avoidance response of rats, presumably by enhancing memory processes. Vasopressin is metabolized by the brain tissue into shorter peptides, such as [pGlu4r,Cyt6]VP(4–9[ and [pGIu4,Cyt6,]VP(4–8), which preserve
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