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Growth of wild-type (WT) (A) and ethanol-tolerant (ET) (B) C. phytofermentans strains at 30°C in GS2 medium with 3 g liter−1 glucose supplemented with ethanol at the following levels (vol/vol): 0% (red squares), 2% (green circles), 4% (blue triangles), 6% (yellow diamonds), and 7% (black X's). Data points of growth (OD600) represent means of results from triplicate 400-μl cultures in sealed microtiter plates; error bars represent 1 standard deviation.
