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Effect of xylitol addition on the growth of recombinant ZM4(pZB5) using xylose (30 g/liter) in flask cultures at 30°C. ●, control without xylitol; ■, 0.5 g of xylitol/liter; ▴, 1 g of xylitol/liter; ▾, 2 g of xylitol/liter; ⧫, 5 g of xylitol/liter.
