ATF5 suppresses cell death in normal but not BCR-ABL–transformed cells. (A) Cell viability analysis in 32D or 32D/BCR-ABL cells stably expressing a nonsilencing (NS) or ATF5 shRNA. Error bars represent SD. For each cell line, values were normalized to those observed at day 0. (B) 32D or 32D/BCR-ABL cells were treated with a luciferase or ATF5 siRNA and monitored for cell death by annexin V–PE staining. Error bars represent SD. *P < .05; **P > .05.