Clonal analysis by inverse PCR of individual human CFU-GM recovered after 8.5 months engraftment in bnx mice. (A) Human CFU-GM from a mouse (no. 48B2) transplanted with human CD34⁺ progenitors transduced in suspension culture with FL. (B) Human CFU-GM from a mouse (no. 48C3) transplanted with human CD34⁺ progenitors transduced with stromal support. (C) Individual CFU-GM clones and total bone marrow from mouse no. 48C3.