The inactive precursor to pepsin,formed in the cells of the mucous membrane of the stomach and converted to pepsin by hydrochloric acid during digestion.

• 胃蛋白酶，原胃蛋白酶的一种不活跃原，在胃粘膜细胞中形成并在消化的过程中通过盐酸转化为胃蛋白酶。