Mass SpectrometryTandem Mass SpectrometrySpectrometry, Mass, Electrospray IonizationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationGas Chromatography-Mass SpectrometryChromatography, LiquidChromatography, High Pressure LiquidProteomicsSpectrometry, Mass, Secondary IonReproducibility of ResultsMolecular Sequence DataProteomeAmino Acid SequenceSpectrometry, Mass, Fast Atom Bombardment