Spectrometry, Mass, Electrospray IonizationMass SpectrometryTandem Mass SpectrometryChromatography, LiquidSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationIonsCyclotronsChromatography, High Pressure LiquidGasesFourier AnalysisAtmospheric PressureProteomicsGas Chromatography-Mass SpectrometryCalibrationComplex MixturesReproducibility of ResultsPeptidesAir IonizationMolecular StructureMolecular Sequence DataReference StandardsAmino Acid SequenceSensitivity and SpecificityIndicators and ReagentsDeuteriumProteomeSpectroscopy, Fourier Transform InfraredSpectrometry, Mass, Secondary IonElementsNanotechnologyLimit of DetectionMicrochemistryProteinsPeptide MappingSolid Phase ExtractionIsotope LabelingElectrophoresis, CapillaryMyoglobinIsomerismEquipment DesignSpacecraftChromatography, Reverse-PhaseGlycerophospholipidsTrypsinSpectrometry, Mass, Fast Atom BombardmentSaturnEquipment Failure AnalysisModels, ChemicalCarbohydrate SequenceHydrogenSolutionsSolventsPeptide FragmentsDeuterium Exchange MeasurementPhosphopeptidesAnalytic Sample Preparation MethodsElectronsHorsesMolecular WeightInfrared RaysForensic MedicineOxygen IsotopesAlgorithmsMetabolomicsSubstance Abuse DetectionMagnetic Resonance SpectroscopyEvolution, PlanetaryCattleHydrogen-Ion ConcentrationElectrochemistryLiquid-Liquid ExtractionExtraterrestrial EnvironmentOligosaccharidesFlowmetersFullerenesSolid Phase MicroextractionDrug StabilityVolatilizationPhase TransitionMetabolomeElectrophoresis, Gel, Two-DimensionalSequence Analysis, ProteinPharmaceutical PreparationsLasersOligonucleotidesWaterProtonsModels, MolecularChemistry, OrganicAnionsVacuumOrganic ChemicalsAutomationHydrolysisMetals, AlkaliStereoisomerismLipids3,3'-DichlorobenzidineProtein Processing, Post-TranslationalChemical Fractionation