FIG. 6.

Anaerobic growth of MR-1 versus MR-1A (A) or MR-1B (B) cells on fumarate. The medium was supplemented with vehicle (control; dimethylformamide only), MK-4 (10 μM), or DHNA (10 μM). Growth was measured by increases in optical density (OD) measured at 500 nm with a Beckman DU-64 spectrophotometer. Points represent the means for n = 2, and bars represent the range of high and low values; for points lacking apparent range bars, the bars were smaller than the points as shown.