GastritisCarcinoid TumorParietal Cells, GastricH(+)-K(+)-Exchanging ATPaseGastritis, AtrophicAutoimmune DiseasesThymectomyMalignant Carcinoid SyndromeAnemia, PerniciousGastric MucosaCarcinoid Heart DiseaseGastrinsAchlorhydriaHelicobacter pyloriHelicobacter InfectionsIntrinsic FactorAutoantibodiesStomachMice, Inbred BALB CAutoantigensLymphopeniaIleal NeoplasmsBronchial NeoplasmsPyloric AntrumAppendiceal NeoplasmsGastritis, HypertrophicCD4-Positive T-LymphocytesGastroscopyStomach NeoplasmsHydroxyindoleacetic AcidMetaplasiaOctreotideT-Lymphocytes, RegulatoryGastrointestinal NeoplasmsPepsinogen AImmunoglobulin GChromogranin AIntestinal NeoplasmsNeuroendocrine TumorsChromograninsACTH Syndrome, EctopicDisease Models, AnimalBile RefluxMice, Inbred C57BLStomach UlcerStomach DiseasesPeptic UlcerPepsinogen CBiopsyEnterochromaffin CellsDuodenal UlcerThymus NeoplasmsHelicobacter felisHelicobacter heilmanniiChronic DiseaseDuodenitisDuodenal NeoplasmsDyspepsiaCarcinoma, NeuroendocrineSomatostatinHelicobacterParaneoplastic Endocrine SyndromesUreaseEndoscopy, GastrointestinalPepsinogensPostgastrectomy SyndromesGastric JuiceEndoscopyReceptors, SomatostatinPrecancerous ConditionsAppendixEndoscopy, Digestive SystemEnterochromaffin-like CellsPolypsDuodenoscopyCushing SyndromeCampylobacterFlushingAtrophy3-IodobenzylguanidineImmunohistochemistryAcinonyxJejunal Neoplasms