Long-term transgene expression following CDD gene transfer. Percentages (mean ± SEM) of EGFP-expressing peripheral blood granulocytes (and lymphocytes) are given for untreated primary (n = 3, each) recipients from experiments C1-3 (A) and secondary recipients (n = 8) given transplants with bone marrow from animals of experiment C1 (B). Donors were animals from the CDD group following application of 3 cytarabine treatment cycles at 500 mg/kg (intraperitoneally; days 1-4).