derives from N-formyl-L-methionine residue N-(dihydroxymethyl)-L-methionine (fMet) (2S)-2-[(dihydroxymethyl)amino]-4-(methylsulfanyl)butanoic acid 178.0537872314453125 178.2299957275390625 18.010564804077148438 18.020000457763671875 A protein modification that effectively converts an N-formyl-Lmethionine residue to N-(dihydroxymethyl)-L-methionine. C 0 H 2 N 0 O 1 S 0 C 6 H 12 N 1 O 3 S 1 MOD:00030 MOD:01446 N-(dihydroxymethyl)-L-methionine N-formyl-L-methionine hydrate N-orthoformylmethionine N-term PSI-MOD hypothetical modified N-formyl-L-methionine residue