. The intracellular Hoechst 00000 accumulation was measured in presence or absence of the ABCG0-inhibitor Ko000 (0 μM). Data are expressed as mean ± SEM (three independent experiments, one-way ANOVA with Tukey's post hoc test or Fisher LSD post hoc test, \* significant difference in comparison to the control: \*\*\* p ≤ 0.000, \*\* p ≤ 0.00, \* p ≤ 0.00; \# significantly differen