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endogenous definition: The definition of endogenous is coming from the inside. (adjective) An example of something endogenous is a tumor that is caused by conditions inside the body not by externally-introduced conditions such as smoking. ...
A zymogen (/ËzaÉªmÉdÊÉn, -moÊ-/), also called a proenzyme (/ËproÊËÉnzaÉªm/), is an inactive precursor of an enzyme. A zymogen requires a biochemical change (such as a hydrolysis reaction revealing the active site, or changing the configuration to reveal the active site) for it to become an active enzyme.