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The chemical digestion of proteins by digestive fluids. These acidic digestive fluids that are secreted by the gastric glands in the mucous membrane of the stomach are collectively referred to as gastric juice.

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When food reaches stomach the gastric glands present in its mucosa release gastric juice. The gastric juice with pH = 2.
The gastric juice contains hydrochloric acid, digestive enzymes (pepsin, rennin and gastric lipase) and mucus (gastric mucin).
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