Neurophysins are a group of proteins that are associated with the transport and storage of neuropeptides, specifically oxytocin and vasopressin. They are highly concentrated in the posterior pituitary gland, where these neuropeptides are secreted into the bloodstream. Neurophysins are synthesized in the hypothalamus as part of larger precursor proteins called neurophysin-oxytocin and neurophysin-vasopressin.
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