CD4 and acute lymphoblastic leukemia: Another cohort of recipient BALB/c mice was given 10 × 106TCDBM cells along with 0.5 × 106 CD4+ and 0.5 × 106 CD8+ T cells from WT C57BL/6 mice, and 2 × 105 B‐ALL‐luc cells (group 3).