Biosynthesis of cofactors, prosthetic groups, and carriers:Riboflavin, FMN, and FAD

3,4-dihydroxy-2-butanone 4-phosphate synthase (NCBI)
riboflavin synthase (NCBI)
riboflavin synthase, beta subunit (6,7-dimethyl-8-ribityllumazine synthase) (NCBI)