Expansion of EPC directly from peripheral blood.

Rows 1–3: Fold increase of cells expressing erythroid markers CD36, CD71 and glycophorin on day 10 of culture; the values are based on CD34+ fraction (%) on day 0 (0.22%) and on the expansion factor of 150, expressed as an average fold increase throughout the culture (Fig. 1C). The first column indicates the values obtained during the flow cytometry analysis of the three markers (Fig. 2B).Row 4: Fold increase of B19 virus permissive cells (row 4); the values are based on CD34+ fraction (%) on day 0 (0.22%) and on the expansion factor of 150, expressed as an average fold increase throughout the culture (Fig. 1C). The first column indicates the percentage of cells expressing capsid proteins (Fig. 4A).EPC represents erythroid progenitor cells.