Comparison of engraftment levels of human cells in NOD/SCID/γ$cnull$ and NOD/SCID/β2m^nullmice.

(A) At the indicated times after 4 × 10⁴CD34⁺ cell transplantation, human CD45⁺ cells in mouse peripheral blood were assayed by flow cytometry. (B) Percentage of human CD45⁺ cells in the BM and spleen in each mouse 5 months after transplantation was also examined (n = 3 each; total of 2 independent experiments). *P < .05.