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Pyroglutamyl peptidase II (PPII) is a neuronal ectoenzyme responsible for thyrotropin releasing hormone (TRH) degradation at the synaptic cleft. PPII, heterogeneously distributed in different brain regions and adenohypophysis, is regulated under various endocrine conditions where TRH is involved in thyrotropin or prolactin regulation but only at the adenohypophyseal level. TRH can downregulate PPII...
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