Relative expression levels of HXT genes after a change in oxygen provision. The heatmap of the relative expression levels of genes encoding hexose transporters and glucose sensors after change in oxygen provision. A. Shift from aerobic to anaerobic conditions. B. Shift from anaerobic to aerobic conditions. C. Shift from hypoxic (1% O2) to anaerobic conditions. D. Shift from anaerobic to hypoxic (1% O2) conditions.