Donor human cell presence within PB after birth (13, 23, and 65 weeks after transplantation).

To determine whether cotransplanting stroma altered the long-term engraftment/differentiation of donor human cells, sheep that had been transplanted in utero with either HSC alone or in conjunction with autologous stromal cells were allowed to complete gestation and were subsequently analyzed by flow cytometry at birth, 3 months, and 12 months for the presence of human CD45⁺ cells in their PB. Values represent the mean ± 1 SEM.