英语语法分析

Chief cells make and secrete pepsinogen.

主细胞制造和分泌胃蛋白酶原。

The impressively named chief cells secrete pepsinogen which, when it mixes with stomach acid, becomes an enzyme called pepsin.

而令人印象深刻的主细胞则分泌胃蛋白酶原，当它与胃酸混合时，就形成一种酶，叫做胃蛋白酶。

In this study, the ontogeny of pepsinogen producing cells in rat fundic glands was studied by in situ hybridization using a digoxigenin-labeled RNA probe.

本研究采用地高辛标记的RNA探针，用原位杂交的方法研究了大鼠胃底腺中胃蛋白酶产生细胞的个体发育。