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Reversal effect of several ABC transporter inhibitors in KB-3-1 and KB/ATO. (A) Verapamil; (B) sildenafil; (C) sipholenol A; (D) pranlukast (ONO-1078); (E) PAK-104P; (F) fumitremorgin C (FTC). Cell survival rate was determined by the MTT assay as described in Section 2.3. Data points with error bars represent the mean ± SD. Each above figure is a representative of three independent experiments, each done in triplicate.
