Gene expression under the ethanol stress. Comparison of mRNA expression of Saccharomyces cerevisiae NRRL Y-50316 and NRRL Y-50049 by fold changes from 0 h to 48 h after the ethanol challenge treatment. Corresponding genes were categorized by functions involved in fatty acid biosynthesis (A), ergosterol metabolism (B), proline metabolism (C), trehalose metabolism (D), tryptophan metabolism (E), glycerol metabolism (F), heat shock protein family (G), glycolysis (H), pentose phosphate pathway (I), pleiotropic drug resistance gene family (J) and related transcription factor genes (K). Expressions for each gene at each time point were presented in relative fold changes against that of Y-50049 at 0 h. Green indicates enhanced expression, red for repressed expression, and yellow for no significant changes. Scales of expressions were indicated by a an integrated color bar at the bottom.