Nicotinamide phosphoribosyltransferase (Nampt) is a rate-limiting enzyme in the mammalian NAD+ biosynthesis of a salvage pathway and exists in 2 known forms. intracellular Nampt (iNampt) and a secreted form. extracellular Nampt (eNampt). eNampt can generate an intermediate product. https://www.allfixelectricales.shop/product-category/fridge-hinge-insert/