The CD163p2 motif promotes erythroid expansion. (A) Numbers of viable rat erythroblasts after culture for different times on CD163 peptide p2 and control peptide p3. (B) Maturation of rat erythroblasts after culture for different times on CD163 peptide p2 and control peptide p3. Results in panels A and B are from one representative experiment of 3. (C) Binding of rat erythroblasts at different stages after in vitro maturation in the presence of 2 IU/mL EPO to CD163p2 and control p3 peptides. Data shown are the means ± SD from 3 independent experiments. Statistics: 2-tailed t test.