Effect of psammaplin A on the viability of macrophage cell line RAW 264.7. Macrophage cells were treated with various concentrations of psammaplin A for 12 hr. Relative cell viability was determined by WST-8 and 1-Methoxy PMS and is shown as a percentage of living cells. Data are shown as means ± SD of three independent experiments. * Data are significantly different from control group at p < 0.001.