(b) Suppression of Htt103Q toxicity in yeast by Gpx1, Hyr1 (Gpx3) and mGpx1. The viability of the parental strain, Y258, and of cells overexpressing yeast GPxs was determined using spotting assays. Equal numbers of cells were serially diluted fivefold and plated on medium containing glucose to assess cell numbers and containing galactose (GAL) to induce the expression of Htt103Q and the indicated ORF. 