Mass SpectrometryTandem Mass SpectrometryPeptidesSpectrometry, Mass, Electrospray IonizationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationGas Chromatography-Mass SpectrometryChromatography, LiquidChromatography, High Pressure LiquidPeptide FragmentsProteomicsAmino Acid SequenceMolecular Sequence DataPeptide MappingSpectrometry, Mass, Secondary IonPeptide LibraryProteomeSpectrometry, Mass, Fast Atom BombardmentAntimicrobial Cationic PeptidesPeptides, CyclicElectrophoresis, Gel, Two-DimensionalProtein BindingOligopeptidesMagnetic Resonance SpectroscopyMolecular StructureIsotope LabelingDeuterium Exchange MeasurementProteinsModels, MolecularReproducibility of ResultsTrypsinProtein ConformationReference StandardsBinding SitesCalibrationSensitivity and SpecificityProtein Processing, Post-TranslationalIonsElectrophoresis, Polyacrylamide GelKineticsDeuteriumCarbohydrate SequenceMolecular WeightRecombinant ProteinsSolid Phase ExtractionCattleNatriuretic Peptide, BrainLimit of DetectionBase SequenceSequence Homology, Amino AcidBody Mass IndexSequence Analysis, ProteinProtein Structure, TertiaryAmino AcidsIndicators and ReagentsChromatography, Thin LayerEscherichia coliCell LineBacterial ProteinsFourier AnalysisSubstrate SpecificityMetabolomicsHydrolysisGlycosylationSubstance Abuse DetectionProtein Structure, SecondaryChromatography, GasVasoactive Intestinal PeptideCalcitonin Gene-Related PeptidePeptide BiosynthesisCyclotronsCell-Penetrating PeptidesIsotopesPeptide HydrolasesPolysaccharidesAnalytic Sample Preparation MethodsTime FactorsStructure-Activity RelationshipIsomerismCloning, MolecularPhosphorylationBiological MarkersPeptide YYOxidation-ReductionProtein PrecursorsChromatography, Reverse-PhaseOligosaccharidesPeptide SynthasesSequence AlignmentEpitopesMetabolomePeptide Nucleic AcidsModels, ChemicalCysteineChromatography, AffinityComplex MixturesSpectroscopy, Fourier Transform InfraredCarbohydrate ConformationHydrogen-Ion ConcentrationElectrophoresis, CapillaryNatriuretic Peptide, C-Type