Genotype: MATa ura3-52 lys2-801_amber ade2-101_ochre trp1-Δ63 his3-Δ200 leu2-Δ1 Notes: Contains nonrevertible (deletion) auxotrophic mutations that can be used for selection of vectors. Note that trp1-Δ63, unlike trp1-Δ1, does not delete adjacent GAL3 UAS sequence and retains homology to TRP1 selectable marker. gal2-, does not use galactose anaerobically.