Tandem Mass SpectrometryMass SpectrometrySpectrometry, Mass, Electrospray IonizationChromatography, LiquidSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationChromatography, High Pressure LiquidProteomicsGas Chromatography-Mass SpectrometryProteomeMolecular Sequence DataAmino Acid SequenceSolid Phase ExtractionPeptidesReference StandardsElectrophoresis, Gel, Two-DimensionalSpectrometry, Mass, Fast Atom BombardmentNeonatal ScreeningCalibrationMolecular StructureSensitivity and SpecificitySpectrometry, Mass, Secondary IonReproducibility of ResultsTandem Repeat SequencesIsotope LabelingLimit of DetectionPeptide MappingMetabolism, Inborn ErrorsIonsSubstance Abuse DetectionIndicators and ReagentsSequence Analysis, ProteinProteinsChromatography, Reverse-PhaseIndicator Dilution TechniquesDatabases, ProteinComplex MixturesPeptide FragmentsDeuteriumChemical FractionationIsomerismTrypsinDried Blood Spot TestingDeuterium Exchange MeasurementProtein Processing, Post-TranslationalIsotopesCarbohydrate SequenceMicrochemistryAlgorithmsBiotransformationAtmospheric PressureOxygen IsotopesAcetonitrilesDrug StabilityFourier AnalysisSoftwareMagnetic Resonance SpectroscopyMetabolomicsGlucuronidesElectrophoresis, Polyacrylamide GelElectrophoresis, CapillaryBlood Specimen CollectionCattleProtein BindingChromatography, GasForensic MedicinePhosphopeptidesAnalytic Sample Preparation MethodsOxidation-ReductionAconitumCarnitineOligosaccharidesGasesImmunoassayGlycosylationBiological MarkersPaperGlycerophospholipidsDNA AdductsPolysaccharidesChromatography, Thin LayerDrug ResiduesTime FactorsModels, ChemicalModels, MolecularBase SequenceCarbohydrate ConformationNanotechnologySpectrophotometry, UltravioletStereoisomerismMolecular WeightVeterinary DrugsHydrolysisChemistry Techniques, AnalyticalLysineQuality ControlBacterial ProteinsBlood Chemical AnalysisBinding SitesSpectroscopy, Fourier Transform InfraredCysteine