CDD gene transfer protects granulopoiesis and thrombopoiesis from cytarabine toxicity. Peripheral blood granulocyte (A) and thrombocyte (B) counts (mean ± SEM; n = 5) in animals given transplants with CDD- or control-transduced bone marrow during 3 cycles of cytarabine treatment are given for a representative experiment (C1). */** denotes significant differences (P < .05/.01) in nadir levels by Student t test.