PCR for the neo gene in bnx/hu bone marrow. DNA was extracted from the bone marrow samples of each mouse and subjected to PCR to detect the presence of the neo gene in the LN provirus. The results from experiments no. 43 and no. 48 are shown. SNS indicates that in vitro transduction of the human hematopoietic cells was performed in suspension culture (supernatant, no stromal support). SNS + FL, same conditions but with the inclusion of 100 ng/mL FLT3 ligand. SOS indicates that the human hematopoietic progenitors were transduced on stromal support (supernatant on stroma).