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Biology 50 Online
OpenStudy (anonymous):

pepsinigen zymogen activation stimulated by ? A. elastase B. trypsin C. HCL D. Enterokinase E. all right

thomaster (thomaster):

pepsinogen is the zymogen of pepsin. It is released by the chief cells in the stomach and cuts proteins from the food into peptides. So knowing that it is released in the stomach, you probably can already guess that the answer is hydrochloric acid, the main ingredient of gastric juice.

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