Erythropoiesis in pomalidomide-treated conditions is analogous to fetal-state erythropoiesis. (A) Adult peripheral blood or cord blood–derived CD34⁺ cells were differentiated toward the red cell lineage using the three-phase culture system. Protein lysates were collected at day 4 and immunoblotted for the indicated proteins (N = 3). (B) Quantification of immunoreactive bands normalized to GAPDH.