Detection of apoptotic cells by means of TdT assay in untreated and AG957-treated 32D-T2/93 (BCR/ABL-negative) and 32DLG7 (BCR/ABL-positive) cell lines. Mean (±SEM) percentages of apoptotic cells in the live gated cell populations are indicated for 32DT2/93 (left panels) and 32DLG7 (right panels) cells exposed to graded concentrations of AG957 for 12 hours.