Flux distributions of central metabolic reactions under four different growth conditions. The length of each bar indicates the flux value of each reaction. Four conditions are GA (glucose aerobic), GSA (glucose semiaerobic), XA (xylose aerobic), and XSA (xylose semiaerobic). Briefly, G is for glycolysis, C for citrate cycle, X for xylose degradation, P for Pentose Phosphate Pathway, and E for ethanol synthesis. The detailed information of abbreviated reactions is available in Additional file 3.