Isotope LabelingMass SpectrometryTandem Mass SpectrometryPeptidesIsotopesSpectrometry, Mass, Electrospray IonizationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationGas Chromatography-Mass SpectrometryChromatography, LiquidOxygen IsotopesNitrogen IsotopesCarbon IsotopesChromatography, High Pressure LiquidPeptide FragmentsProteomicsAmino Acid SequenceMolecular Sequence DataPeptide MappingSpectrometry, Mass, Secondary IonProteomeDeuteriumPeptide LibrarySpectrometry, Mass, Fast Atom BombardmentAntimicrobial Cationic PeptidesPeptides, CyclicZinc IsotopesElectrophoresis, Gel, Two-DimensionalMagnetic Resonance SpectroscopyProtein BindingMolecular StructureDeuterium Exchange MeasurementOligopeptidesSulfur IsotopesKineticsProteinsReproducibility of ResultsModels, MolecularIron IsotopesReference StandardsTrypsinCalibrationBinding SitesProtein ConformationIndicator Dilution TechniquesSensitivity and SpecificityIonsProtein Processing, Post-TranslationalElectrophoresis, Polyacrylamide GelAmino AcidsRadioisotope Dilution TechniqueRecombinant ProteinsSolid Phase ExtractionMolecular WeightCattleLimit of DetectionCarbohydrate SequenceBase SequenceSubstrate SpecificityNatriuretic Peptide, BrainEscherichia coliSequence Homology, Amino AcidIndicators and ReagentsMetabolomicsOxidation-ReductionHydrolysisBody Mass IndexChromatography, Thin LayerProtein Structure, TertiarySequence Analysis, ProteinFourier AnalysisHydrogenChromatography, GasBacterial ProteinsCell LineModels, ChemicalStrontium IsotopesTime FactorsSubstance Abuse DetectionProtein Structure, SecondaryChemical FractionationHydrogen-Ion ConcentrationGlycosylationVasoactive Intestinal PeptideCyclotronsStructure-Activity RelationshipCalcitonin Gene-Related PeptidePeptide BiosynthesisIsomerismBiological MarkersCell-Penetrating PeptidesPolysaccharidesPeptide HydrolasesPhosphorylationAnalytic Sample Preparation MethodsMetabolomeCloning, MolecularLysineSpectroscopy, Fourier Transform InfraredCysteineOligosaccharides