Pepsinogens A, D, and C have been isolated from the gastric mucosae of chickens using ion-exchange and molecular sieve chromatography and were found to have molecular weights of approximately 42,000. Pepsinogens A and D are closely related in their amino acid compositions, electrophoretic mobilities, and stabilities. Pepsinogen C is significantly different in these properties. Unlike swine pepsin, M ultiple forms of pepsinogen, which yield enzymes ~ ~~~ ____ ~ * Publication No. 709 from the Graduate
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