YDR236C FMN1 SGDID:S000002644, Chr IV from 935892-935236, Genome Release 64-1-1, reverse complement, Verified ORF, "Riboflavin kinase, phosphorylates riboflavin to form riboflavin monophosphate (FMN), which is a necessary cofactor for many enzymes; localizes to microsomes and to the mitochondrial inner membrane"