YPL023C MET12 SGDID:S000005944, Chr XVI from 506312-504339, Genome Release 64-1-1, reverse complement, Verified ORF, "Protein with methylenetetrahydrofolate reductase (MTHFR) activity in vitro; null mutant has no phenotype and is prototrophic for methionine; MET13 encodes major isozyme of MTHFR"