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PC1 and PC2 are subtilisin-like processing enzymes capable of cleaving thyrotropin releasing hormone (TRH) precursor (pro-TRH) at paired basic residues in vitro. In the paraventricular nucleus of the hypothalamus (PVN), pro-TRH is synthesized to control adenohypophysial thyrotropin and prolactin release. Biochemical and immunological approaches have shown that in the hypothalamus, pro-TRH is extensively...