Pepsin APepsinogensBiologySystems BiologyGastric JuicePepstatinsMolecular BiologyDevelopmental BiologyRespiratory AspirationSynthetic BiologyPentagastrinComputational BiologyPepsinogen AGastric MucosaPancreatinNorleucineChymosinHydrogen-Ion ConcentrationAmino Acid SequenceAspartic Acid EndopeptidasesPneumonia, AspirationSecretory RateStomachGastric Acid