Noun
English Wikipedia has an article on:chymotrypsinogenWikipedia
chymotrypsinogen (plural chymotrypsinogens)
(biochemistry) An inactive precursor to chymotrypsin
Activation Chymotrypsin is synthesized in the pancreas by protein biosynthesis as a precursor called chymotrypsinogen that is enzymatically inactive. Source: Internet
Trypsin activates chymotrypsinogen by cleaving peptidic bonds in positions Arg15 - Ile16 and produces π-Chymotrypsin. Source: Internet