Figure 2: Microscopic images show MTT reduction capability of NCI-H460 cells. (a) Microscopic images show the purple colored crystal formation, which is an indication of cell viability. (b) Effect of RSV and PTX on NCI-H460 cells viability. Values are given as means ± S.D. of six experiments in each group. Values not sharing a common marking (a, b, c) differ significantly at P ≤ 0.05 (DMRT).