Cell-surface TR expression. Cells were stained with either the negative control MoAb MOPC195 (dotted lines) or the anti-human TR MoAb ATAP2 (solid lines), and flow cytometry was performed as described in the Materials and Methods. (A) MEG-01, (B) HL60, (C) Jurkat, (D) J.RT-T3.5 (TCR-negative), (E) J.CaM1/lck, (F) J.CaM1/rep3 (lck-deficient), (G) J45/CH11, and (H) J45.01 (CD45-deficient).