FMN modified residue 6-FMN modified residue 454.088958740234375 454.329986572265625 6-FMNRes A protein modification that effectively results from forming an adduct with a compound containing a riboflavin phosphate (flavin mononucleotide, FMN) group through the 6 position of FMN. C 17 H 19 N 4 O 9 P 1 MOD:02084 PSI-MOD X natural