Comparison of CRUs of BM cells before and after infection with TetOFFeGFP-AML1a virus. (A) Schedule of retrovirus infection and CRU assays. BM cells were infected with TetOFF-GFP-tetO-AML1a virus and left unsorted. (B) Summary of 3 independent CRU assays on days 0 (before infection) and 6. Cell numbers are presented as day 0 equivalents. Bars represent 95% CIs.