Reproducibility of expression level between replicates. (A) The RPKM of all genes with non-zero expression, (B) anaerobically induced, and (C) anaerobically repressed genes were plotted, with the RPKM of replicate 1 plotted on the x-axis, and the RPKM of replicate 2 plotted on the y-axis. Each spot represents a single gene. Blue circles represent genes expressed aerobically, and red squares represent genes expressed anaerobically. For (B) and (C) a line of m = 1 is included in the chart area.