Growth characteristics of K562/DOX.

(A) Cell viability assessed by trypan blue exclusion of K562/DOX and the parental K562 cell line cultured in the presence or absence of 1 μM imatinib (STI) or 5 μg/mL verapamil (VP) or both. (B) Cell viability of K562/DOX and K562 in the presence or absence of 1 μM imatinib (STI) or 1 μM PSC833 or both.