<p>Initial velocity (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0043902#s4" target="_blank">Methods</a>) is plotted <i>vs.</i> substrate concentration. <b>A.</b> NADH at constant [BQ] = 50 µM. <b>B.</b> BQ at constant [NADH] = 50 µM. <b>C.</b> DCPIP at constant [NADH] = 50 µM. Each plot depicts three temperature treatments of WrbA prior to assay (see text): squares, 5°C; triangles, 23°C; circles, 5°C after 23°C. Solid lines are intended only to guide the eye and do not represent fits to the data.</p
