Malabsorption SyndromesHLA AntigensHLA-DR3 AntigenLactose IntoleranceHLA-DR AntigensAntigensHLA-DR4 AntigenHLA-DR Serological SubtypesSprue, TropicalHLA-DQ AntigensIntestinal AbsorptionAntigens, BacterialHLA-DR2 AntigenLactose Tolerance TestAntigens, NeoplasmSchilling TestAntigens, SurfaceIntrinsic FactorCeliac DiseaseAntigens, ViralHistocompatibility Antigens Class IIBreath TestsJejunumHLA-DR7 AntigenXyloseVitamin B 12Histocompatibility TestingProton-Coupled Folate TransporterKeratoconjunctivitis SiccaHLA-DR1 AntigenGold Sodium ThiomalateHydrogenFructose IntoleranceAntigens, ProtozoanHLA-DRB1 ChainsEpitopesCobalt IsotopesAntigens, Polyomavirus TransformingLactuloseExocrine Pancreatic InsufficiencyGenes, MHC Class IIVitamin B 12 DeficiencyFatsAntigens, CDAntigens, FungalLactoseIntestine, SmallHLA-A AntigensShort Bowel SyndromeHLA-B AntigensDiarrheaAntigens, HelminthH-2 AntigensIntestinal DiseasesFecesAllelesMolecular Sequence DataPancrelipaseEpitopes, T-LymphocyteBile Acids and SaltsHistocompatibility Antigens Class ICarcinoembryonic AntigenAntigens, Viral, TumorPancreatic ExtractsAmino Acid SequenceHistocompatibility AntigensAntibodies, MonoclonalHLA-D AntigensReceptors, Antigen, T-CellCD4-Positive T-LymphocytesHLA-A2 AntigenGlutensAnemia, MegaloblasticDiabetes Mellitus, Type 1HaplotypesTrioleinT-LymphocytesProliferating Cell Nuclear AntigenBlind Loop SyndromeAnemia, MacrocyticSelenium RadioisotopesMilkIleumAnemia, PerniciousReceptors, Antigen, B-CellProstate-Specific AntigenO AntigensPostgastrectomy SyndromesAchlorhydriaFructoseArthritis, RheumatoidGlycocholic AcidDipeptidyl Peptidase 4Antigens, CD8Carbohydrate Metabolism, Inborn ErrorsIntestinal MucosaAntigens, CD15Jejunoileal BypassEnzyme-Linked Immunosorbent AssayIntestines