(C,F) Cells were grown to mid-log phase either in rich medium or shifted for 8 hours to starvation medium. Zygotes and tetrads, which correspond to differentiated cells, were counted under a light microscope. Cells of the following genotypes were analyzed: WT isogenic controls, gcn5Η, tsc1Η, gcn5Η tsc1Η, rhb1-DA4, gcn5Η rhb1-DA4, gad8Η, and gcn5Η gad8Η. Each value represents the mean percentage and SE of differentiating cells to the total number of cells, averaged from 4 independent experiments. At least 200 cells from the indicated genotypes were counted in each experiment. White arrowheads indicate zygotes. Scale bar, 10 μm. 