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Pepsin is an enzyme that digests protein foods in the mammalian stomach.

Pepsin is an enzyme that digests protein foods in the mammalian stomach.
Yes it is. What are you asking about it?

It is unusual amongst enzymes in the human body in that most of them work optimally at close to a neutral pH while pepsin functions best in the low (acidic) pH of the stomach (which of course has hydrochloric acid secreted into it).

The name relates to the breaking down of polypeptides (proteins are composed of one or more polypeptides) into peptides.

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