YNL280C ERG24 SGDID:S000005224, Chr XIV from 110411-109095, Genome Release 64-1-1, reverse complement, Verified ORF, "C-14 sterol reductase, acts in ergosterol biosynthesis; mutants accumulate the abnormal sterol ignosterol (ergosta-8,14 dienol), and are viable under anaerobic growth conditions but inviable on rich medium under aerobic conditions"