YCL064C CHA1 SGDID:S000000569, Chr III from 16880-15798, Genome Release 64-1-1, reverse complement, Verified ORF, "Catabolic L-serine (L-threonine) deaminase, catalyzes the degradation of both L-serine and L-threonine; required to use serine or threonine as the sole nitrogen source, transcriptionally induced by serine and threonine"