Hematopoietic reconstitution after transplantation of PDGF-B^−/− or PDGFRβ^−/− fetal liver cells.

Fetal liver cells from wild-type (filled bars) or null mutant littermates (open bars) were collected from embryos (E16.5) from the (A) PDGF-B and (B) PDGFRβ breeding colony and transplanted into 14-Gy–irradiated B6.Ly-5^a recipients (5 × 10⁶ to 10 × 10⁶/recipient). Data were obtained from 4 independent transplantation experiments. Each symbol represents the mean percentage from analysis of 4 to 10 recipients. PMN indicates polymorphonuclear cells; mono, monocytes.