hydroxylated residue modified L-histidine residue 2-Oxohistidine 15.994915008544921875 153.0538330078125 153.1399993896484375 16.0 A protein modification that effectively converts an L-histidine residue to 2-oxohistidine. C 0 H 0 N 0 O 1 C 6 H 7 N 3 O 2 From DeltaMass: Average Mass: 16 Average Mass Change:16 References:Lewisch, S. A. and Levine, R. L. (1995) Anal. Biochem. 231, 440-446. Determination of 2-oxo-histidine by amino acid analysis Notes:Rod LevineNIHBldg 3, Room 106 MSC 0320Bethesda, MD 20892-0320email: rlevine@nih.govvoice: 1 (301) 496-2310fax: 1 (301) 496-0599 H MOD:00971 PSI-MOD natural