Amino acid code Name Single Letter Code Multiple Letter Code D-Amino Acid Code Alanine A {ALA} {d-ALA} Arginine R {ARG} {d-ARG} Asparagine N {ASN} {d-ASN} Aspartic Acid D {ASP} {d-ASP} Cysteine C {CYS} {d-CYS} Glutamic Acid E {GLU} {d-GLU} Glutamine Q {GLN} {d-GLN} Glycine G {GLY} Homocysteine {HCY} {d-HCY} Histidine H {HIS} {d-HIS} Homoserine {HSE} {d-HSE} Isoleucine I {ILE} {d-ILE} Leucine L {LEU} {d-LEU} Lysine K {LYS} {d-LYS} Methionine M {MET} {d-MET} Norleucine {NLE} {d-NLE} Norvaline {NVA} {d-NVA} Ornithine {ORN} {d-ORN} Penicillamine {PEN} {d-PEN} Phenylalanine F {PHE} {d-PHE} Proline P {PRO} {d-PRO} Serine S {SER} {d-SER} Threonine T {THR} {d-THR} Tryptophan W {TRP} {d-TRP} Tyrosine Y {TYR} {d-TYR} Valine V {VAL} {d-VAL} Pyroglutamate {pGLU} {d-pGLU} Dinitrobenzylation (LYS) {Lys(Dnp)} Phosphorylation (THR) {pTHR} Phosphorylation (SER) {pSER} Phosphorylation (TYR) {pTYR} Gamma-GLU {gamma-GLU} {d-gamma-GLU} Citrulline {CIT} N-methylated ALA {nme-ALA} N-methylated Isoleucine {nm...