Complementation of adr1 suppressor mutant 33-1. Shown are colony morphologies of 33-1 transformed with a vector control (pHyg101, top left), a plasmid carrying the wild-type ras2 allele (pX6-9, top right), a plasmid carrying the activated ras2Val16 allele (prV16Hyg, bottom left), and a plasmid carrying a disrupted ras2 allele (pX696rh, bottom right).