人體消化系統中主要的脂酶是由胰臟所分泌的人類胰臟脂酶和胰臟脂酶相關蛋白2(pancreatic lipase related protein 2,PLRP2)。除此之外,人體中還有其他一些脂酶,包括肝脂酶(hepatic lipase)、內皮脂酶(endothelial lipase)和脂蛋白酯酶(lipoprotein lipase)。並非所有的酯酶都在消化道中發揮作用(見下表)。
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