1) Enzyme 2) Precursor of pepsin 1) Propepsin 
• (n.) The antecedent of the ferment pepsin. A substance contained in the form of granules in the peptic cells of the gastric glands. It is readily convertible into pepsin. Also called propepsin.
A substance made by cells in the stomach. Acid in the stomach changes pepsinogen to pepsin, which breaks down proteins in food during digestion.
The inactive precursor (42.5 kD) of pepsin. ... (18 Nov 1997) ... 
(pep-sin´ә-jәn) a zymogen secreted by the chief cells of the gastric glands and converted into pepsin in the presence of gastric acid or of pepsin itself.
The inactive precursor (42.5 kD) of pepsin.
Pep·sin'o·gen noun [ Pepsin + -gen .] (Physiol. Chem.) The antecedent of the ferment pepsin. A substance contained in the form of granules in the peptic cells of the gastric glands. It is readily convertible into pepsin. Also called propepsin . 
Type: Term Pronunciation: pep-sin′ō-jen Definitions: 1. A proenzyme or zymogen formed and secreted by the chief cells of the gastric mucosa; the acidity of the gastric juice and pepsin itself remove 44 amino acyl residues from pepsinogen to form active pepsin. Synonyms: propepsin
[n] - precursor of pepsin
noun precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach