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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 soluble protein molecules that can speed up chemical reactions in cells. Like all proteins they consist of a string of different amino acid sub units. The amino acids must occur in the correct sequence for the enzyme to work. This sequence is controlled by the genetic code for the protein.