Fig. 1.
ACEu values for Escherichia coli gene pairs with similar functions expressed under aerobic or anaerobic conditions. Homologous gene pairs (anaerobic gene first): frdA/sdhA, frdB/sdhB, frdC/sdhC, frdD/sdhD, narG/narZ, narH/narY, and narI/varV; analogous operon pairs: cydAB/cyoABCD, plfB/aceEF, menABCDEFH/ubiABCDEFGH, and metH/metE. All values are for E. coli genes (black points) except the Salmonella enterica Typhimurium metHE genes (gray point). Error bars represent 1 standard deviation.