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professional
professional association
professional corporation
professional foul
professionalise
professionalism
professionalize
professor
professoriate
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proenzyme
pro·en·zyme [ prō én zm ] (plural pro·en·zymes)


noun 
Definition:
 
enzyme precursor: the inactive precursor of an enzyme, especially one secreted by living cells and activated by an acid, another enzyme, or other catalytic means
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