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Pepsinogen (PG), a precursor of pepsin secreted by the stomach and involved in digestion, is a single-chain polypeptide with a molecular mass of 42 kDa.Most of it is secreted into the gastric cavity, and a small fraction, usually 1% of PG, enters the bloo

Pepsinogen (PG), a precursor of pepsin secreted by the stomach and involved in digestion, is a single-chain polypeptide with a molecular mass of 42 kDa.Most of it is secreted into the gastric cavity, and a small fraction, usually 1% of PG, enters the bloo