Isotope LabelingIsotopesPeptidesNitrogen IsotopesOxygen IsotopesCarbon IsotopesPeptide FragmentsPeptide LibraryAntimicrobial Cationic PeptidesPeptides, CyclicZinc IsotopesSulfur IsotopesDeuteriumPeptide MappingOligopeptidesIron IsotopesAmino Acid SequenceMass SpectrometryNatriuretic Peptide, BrainKineticsStrontium IsotopesMolecular Sequence DataVasoactive Intestinal PeptideProtein BindingCalcitonin Gene-Related PeptideCell-Penetrating PeptidesRadioisotope Dilution TechniquePeptide BiosynthesisModels, MolecularPeptide YYChromatography, High Pressure LiquidBinding SitesProtein ConformationPeptide Nucleic AcidsNatriuretic Peptide, C-TypeNatriuretic PeptidesAmino AcidsProtein Structure, SecondaryGastrin-Releasing PeptideReceptors, Formyl PeptidePeptide PHI