Expression of Pgp on T-cell leukemia cell lines. HL-60 and HL-60/ADM cells were used as positive controls. (A) HL-60, (B) HL-60/ADM, (C) ATL-2, (D) ATL-2/ADM cl-2, (E) SALT-3, and (F) SALT-3/ADM cl-2.