Cell survival in response to DT₃₈₈–GM-CSF treatment.

HL-60 and HL-60/VCR cells, seeded in 96-well plates, were treated with increasing concentrations of DT₃₈₈–GM-CSF for a 3-day period. Cell viability was assessed spectrophotometrically using Promega reagents as described in “Materials and methods.” Data represent the mean ± SD of 6 replicates. SD bars were coincident with symbols.