A, Northern blot analysis was performed on RNA harvested at the indicated times after glucose addition to cultures of DY103 (WILD TYPE), DY106 (dst1), DY105 (rpb2–10), and DY108 (rpb2–10 dst1) cells grown for 2 h in galactose. RNA was also prepared from control cells that were not induced with galactose (−). The blot was probed for GAL1 mRNA, and results were quantitated using a PhosphorImager for three separate experiments. GAL1 transcript levels were corrected for background signal in the same area for each lane. Transcript levels for each strain were calculated relative to its zero time value, and the means and standard deviations (error bars) were plotted (B).