PepsinogensPepsin APepsinogen APepsinogen CPepstatinsGastric MucosaGastritis, AtrophicChymosinChief Cells, GastricGastric JuiceGastrinsProventriculusStomachHelicobacter pyloriEnzyme PrecursorsDuodenal UlcerTunaHydrogen-Ion ConcentrationHelicobacter InfectionsAmino Acid SequenceNorleucineGastritisAmino AcidsGastric AcidMacacaRespiratory AspirationGastritis, HypertrophicStomach Neoplasms