Figure 3: Survival relative to the untreated control, determined by the MTT assay. Relative cell number determined by Crystal Violet. Cells were plated in microplates at 10,000 cells/well then treated with Pyrethrum (4g/L Pyrethrins plus 16 g/LPiperonyl Butoxide) for 1h. *Significant difference at P<0.05. Data are shown as percentage relative to untreated control and are mean of 3 replicates ± S.E.M.