Trifluoroacetic AcidFluoroacetatesAspartic AcidAcetic AnhydridesChromatography, High Pressure LiquidHydrochloric AcidChromatography, Reverse-PhaseSpectrometry, Mass, Electrospray IonizationAmino AcidsAspartic Acid ProteasesAmino Acid SequenceMolecular StructureSpectrophotometry, UltravioletMass SpectrometryCyanogen BromideSolventsIndicators and ReagentsMolecular Sequence DataAspartic Acid EndopeptidasesPeptidesChromatography, LiquidPeptide FragmentsChromophore-Assisted Light InactivationSpectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization