Cdc42GAP regulates HSP engraftment. One million donor-derived fetal liver cells mixed with 1 million recipient-derived fetal liver cells from B6.SJL/BoyJ mice were injected into lethally irradiated B6.SJL/BoyJ mice. Chimerism in the peripheral blood of the recipients was examined at indicated times after transplantation. Numbers of each group of animals that underwent transplantation are indicated. Results are representative of 2 independent experiments.