DipeptidesCarnosineDipeptidasesNod2 Signaling Adaptor ProteinGlycylglycineDiketopiperazinesSymportersAnserineGlycopeptidesOligopeptidesAmino AcidsGlycineAmino Acid SequenceCathepsin CSubstrate SpecificityCefadroxilPeptidesDipeptidyl-Peptidases and Tripeptidyl-PeptidasesCephalexinMolecular Sequence DataAlanineKineticsHydrolysisBiological TransportPeptide SynthasesAdjuvants, ImmunologicStructure-Activity RelationshipAminopeptidasesIntestinal AbsorptionLeucineStereoisomerismHydrogen-Ion ConcentrationProlinePeptidoglycanPeptides, CyclicIntestine, SmallDipeptidyl Peptidase 4Receptor-Interacting Protein Serine-Threonine Kinase 2Cord FactorsJejunumEscherichia coliMembrane Transport ProteinsPhenylalanineHartnup DiseaseModels, MolecularLeucyl AminopeptidaseCarrier Proteins