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Growth of recombinant S. cerevisiae strains expressing different XIs. SC medium (without uracil) contained 20 g liter−1 d-xylose as the sole carbon source. Yeast strains were grown aerobically as shake-flask cultures at 30°C. Yeast strain MKY9 contained the different XI genes. Symbols: ▪, opt-XI-Clos; ▴, opt-XI-Piro; ⧫, XI-Clos; □, empty vector. Shown are results of a typical experiment.
