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Fermentation of xylose by P. stipitis FPL-UC7 (ura3) (A) and P. stipitis FPL-YS30 (xyl3::URA3) (B). Cells were cultured in YPX with 40 g of xylose per liter, with an oxygen transfer rate of 5.3 mM h−1. Symbols: ▾, xylose; ▿, xylulose; ⧫, xylitol; •, cell density; ▪, ethanol. Results in A and B are each from a single representative trial.
