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Synthesis of (R)-AC by GXASR (pTrc99A) and genetically engineered strains harboring different exogenous genes using 50 ml initial fermentation medium at pH 7.0 in 250 ml shake flasks at 250 rpm and 37°C for 40 h (A) residual glucose (B) cell growth (C) (R)-AC production. Error bars represent the standard deviations.
