GastritisGastric MucosaGastritis, AtrophicIntestinal MucosaHelicobacter pyloriHelicobacter InfectionsMouth MucosaStomach UlcerStomachPyloric AntrumMetaplasiaStomach NeoplasmsStomach DiseasesNasal MucosaGastroscopyGastric JuiceParietal Cells, GastricGastritis, HypertrophicGastrinsPepsinogen AGastric AcidBile RefluxAchlorhydriaPepsinogensHelicobacterPeptic UlcerBiopsyMucous MembraneDuodenal UlcerAnti-Ulcer AgentsPrecancerous ConditionsH(+)-K(+)-Exchanging ATPaseHelicobacter heilmanniiUreaseHelicobacter felisPepsinogen CChoristomaGastric FundusDuodenumChronic DiseaseGastric MucinsDuodenitisDyspepsiaAnemia, PerniciousEndoscopy, GastrointestinalImmunohistochemistryColonOlfactory MucosaPostgastrectomy SyndromesHydrochloric AcidOmeprazoleCampylobacterLaryngeal MucosaEndoscopyAtrophyPentagastrinDuodenogastric RefluxAntigens, BacterialEndoscopy, Digestive SystemIntrinsic FactorMucusAmoxicillinEthanolAdenocarcinomaGastric Acidity DeterminationPylorusEsophagusHistamineRats, WistarBacterial ProteinsIndomethacinMucinsRNA, MessengerCimetidineIntestine, SmallMicroscopy, ElectronGastrointestinal HemorrhageAnti-Inflammatory Agents, Non-SteroidalEpitheliumPepsin ADinoprostoneRe-EpithelializationEpithelial CellsBarrett EsophagusSucralfateIntestinesCathepsin EGerbillinaeMeckel DiverticulumGastrin-Secreting CellsHyperplasiaGastrectomyAntibodies, BacterialTime FactorsEnterochromaffin-like CellsIleumDuodenal DiseasesRats, Inbred Strains16,16-Dimethylprostaglandin E2Lewis Blood-Group System