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. Author manuscript; available in PMC: 2012 Mar 15.
Published in final edited form as: Biochemistry. 2011 Feb 14;50(10):1755–1762. doi: 10.1021/bi101662j

Figure 4.

Figure 4

Schematic representation of the most relevant chemical modifications introduced on the Arg amino acid. (a) Modifications on the side chain: I coded Arg, II α-dehydro Arg, III β-dehydro Arg, IV γ-dehydro Arg, V Arg in which the side chain has been reduced one methylenic unit (also denoted nor-arginine), and VI Arg in which the side chain has been enlarged one methylenic unit (also denoted homo-Arginine). (b) VII Retro-modification of the main chain to obtain a retroamide bond (retro-Arg).