Quantitative determination of FCCP toxicity in human ovarian carcinoma and human lung carcinoma cells. Percent cell viability in A: A2780 cells, B: Ovcar3 cells, C: A549 cells, D: H69/AR cells exposed to either FCCP in DMSO or FCCP in DMSO with PC: Cholesterol liposomes for 4 h at indicated concentrations of FCCP. Values represent mean ± standard deviation from three independent experiments.