ChymosinStomachEnzyme PrecursorsPepsinogensPepsinogen AStomach NeoplasmsAcrylamideAcrylamidesCattleUreaInclusion BodiesStomach DiseasesCircular DichroismProtein DenaturationHydrogen-Ion ConcentrationEscherichia coliDisulfidesRecombinant ProteinsProtein FoldingGastric MucosaStomach UlcerMilkSpectrometry, FluorescenceCloning, MolecularAmino Acid SequenceCysteineEnzyme Activation