Isotope LabelingTrypsinIsotopesPeptidesNitrogen IsotopesOxygen IsotopesCarbon IsotopesPeptide FragmentsPeptide LibraryAntimicrobial Cationic PeptidesAmino Acid SequencePeptides, CyclicZinc IsotopesPeptide MappingSulfur IsotopesTrypsin Inhibitor, Kazal PancreaticOligopeptidesTrypsin Inhibitor, Kunitz SoybeanKineticsDeuteriumMolecular Sequence DataMass SpectrometryIron IsotopesBinding SitesChymotrypsinProtein BindingPeptide HydrolasesProtein ConformationTrypsin Inhibitor, Bowman-Birk SoybeanAmino AcidsNatriuretic Peptide, BrainChromatography, High Pressure LiquidModels, MolecularAprotininStrontium IsotopesMolecular WeightVasoactive Intestinal PeptideCattleTrypsinogenCalcitonin Gene-Related PeptideCell-Penetrating PeptidesPeptide BiosynthesisRadioisotope Dilution TechniqueStructure-Activity RelationshipSubstrate SpecificityBase SequencePeptide YYHydrogen-Ion ConcentrationHydrolysisPeptide Nucleic AcidsNatriuretic Peptide, C-TypeCell LineEpitopesSequence Homology, Amino AcidRecombinant ProteinsNatriuretic PeptidesEscherichia coliEndopeptidasesTandem Mass SpectrometryProtein Structure, SecondaryProtein PrecursorsProteinsMagnetic Resonance SpectroscopyGastrin-Releasing PeptideProteomicsReceptors, Formyl PeptideSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationProtease Inhibitors