Transplantation of Smad4^Δ/Δ bone marrow cells into wild-type recipient mice did not lead to the development of anemia. Hemoglobin level, hematocrit, MCV, reticulocyte count, leukocyte count, and platelet count remained stable in the control and experimental groups. Eight recipients of Smad4^Δ/Δ bone marrow cells and 4 recipients of Smad4^fl/fl controls were analyzed 8 weeks after transplantation. Dots represent the values of individual mice; horizontal lines indicate the mean.