FACS analysis on PB at 169 weeks after transplantation.

The PB was obtained at intervals from sheep transplanted in utero with HSC alone (n = 3) or in combination with allogeneic human stromal cells (n = 4). This scatter plot shows the levels of human CD45⁺ cells in the PB of each of these sheep at 169 weeks after transplantation as well as the mean percentage of human cells present ± 1 SEM for each experimental group as a whole.