Percentages of human CD45 cells detected in peripheral blood of NOD/SCID mice. Columns represent the mean value (from 8 animals) with standard deviations of the areas under the curve (AUC) of CD45 cell percentages in the blood of NOS/SCID mice. ^*A statistically significant difference with P < .05 as compared with infusion of “CD34⁺alone”; ^**a difference with P < .01.