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Answer for the clue "Any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active ", 9 letters:
proenzyme

Word definitions for proenzyme in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) Any inactive precursor of an enzyme that is converted to an enzyme by proteolysis; a zymogen

WordNet Word definitions in WordNet
n. any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active [syn: zymogen ]