Liu, Y Variation in proton affinity of the guanidino group between free and blocked arginine. [electronic resource] - Amino acids Jul 2007 - 145-50 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1438-2199 Standard No.: 10.1007/s00726-006-0401-3 doi Subjects--Topical Terms: Arginine--chemistryGuanidine--chemistryPeptide Fragments--chemistryPhosphorylationProtonsSpectrometry, Mass, Electrospray IonizationSpectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization