Mass SpectrometryTandem Mass SpectrometryIsotopesIsotope LabelingSpectrometry, Mass, Electrospray IonizationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationGas Chromatography-Mass SpectrometryChromatography, LiquidOxygen IsotopesNitrogen IsotopesCarbon IsotopesProteomicsChromatography, High Pressure LiquidSpectrometry, Mass, Secondary IonDeuteriumProteomeMolecular Sequence DataAmino Acid SequenceSpectrometry, Mass, Fast Atom BombardmentZinc IsotopesElectrophoresis, Gel, Two-DimensionalSulfur IsotopesDeuterium Exchange MeasurementPeptidesIron IsotopesMolecular StructureReproducibility of ResultsReference StandardsCalibrationPeptide MappingMagnetic Resonance SpectroscopyIndicator Dilution TechniquesRadioisotope Dilution TechniqueSolid Phase ExtractionSensitivity and SpecificityProteinsLimit of DetectionIonsCarbohydrate SequenceMetabolomicsBody Mass IndexChromatography, GasStrontium IsotopesKineticsPeptide FragmentsChromatography, Thin LayerSubstance Abuse DetectionHydrogenFourier AnalysisOxidation-ReductionIndicators and ReagentsCyclotronsChemical FractionationProtein BindingProtein Processing, Post-TranslationalTrypsinMetabolomeAnalytic Sample Preparation MethodsElectrophoresis, Polyacrylamide GelPolysaccharidesModels, MolecularIsomerismOligosaccharidesGlycosylationCattleMolecular WeightModels, ChemicalCarbohydrate ConformationBiotransformationSequence Analysis, ProteinTime FactorsHydrolysisSpectrophotometry, AtomicGasesChromatography, Reverse-PhaseDeuterium OxideRecombinant ProteinsBiological MarkersElectrophoresis, CapillaryBacterial ProteinsComplex MixturesAmino AcidsMicrochemistryEscherichia coliHydrogen-Ion ConcentrationAlgorithmsBinding SitesSubstrate SpecificityStereoisomerismSpectroscopy, Fourier Transform InfraredCarbon RadioisotopesProtein ConformationSpectrophotometry, UltravioletNanotechnologyProtein Array AnalysisForensic MedicineAtmospheric PressureHairGlycomicsMethylation