Fig. 6.

Toxicity of NLD, GPP3 and ALD to Vero cells. Vero cells were incubated with a range of concentrations of NLD (closed inverted triangle), GPP3 (filled square), ALD (filled circle) (A) or DMSO (B) for seven days. MTT assays were then performed and the CC₅₀ was derived from the OD (692 nm) by non-linear regression. Each point represents an average of three independent experiments and standard deviation values are shown. The CC₅₀ values for the three inhibitors were 1.6 μM, 1.0 μM and 7.0 μM respectively. DMSO (1%) had no apparent cytotoxic effect.