Number of human cells generated in the various NOD/SCID mouse models evaluated at 2 weeks and 6 weeks after transplantation. The number of human cells generated in each mouse model was calculated from the RF plus BM at 2 weeks (□) and 6 weeks (▦) after transplantation. *P < .05 versus α-CD122 IF; ♦, P < .05 versus α-CD122 IV. Error bars represent ± SEM.