YNR015W SMM1 SGDID:S000005298, Chr XIV from 653387-654541, Genome Release 64-1-1, Verified ORF, "Dihydrouridine synthase, member of a family of dihydrouridine synthases including Dus1p, Smm1p, Dus3p, and Dus4p; modifies uridine residues at position 20 of cytoplasmic tRNAs"