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A: The enzymes that break down protein include trypsin, chymotrypsin, pepsin, thermolysin, glutamyl endopeptidase, elastase, bromelain and papain. Trypsin, pepsin, elastase, thermolysin, glutamyl, endopeptidase and chymotrypsin are made in the human body. Bromelain comes from pineapples and papain comes from papayas.
Enzymes are proteins that catalyze chemical reactions   Although the enzymes themselves are incapable of regulating these reactions, the enzymes are self-regulated throughâ¦ mechanisms like feedback inhibition and competitive inhibition.