Fig. 2

a Expression CD34 cell surface marker (FITC- or APC-conjugated antibody) in erythroid progenitor cells throughout expansion phase (Phase I) in Protocol C. b Expression of CD235a (GPA) and CD44 at day 8 of the expansion phase. Samples labeled with CD34-44-235a antibodies are represented in blue over IgG controls, in red. c Proportion of CD34-positive cells during the expansion time. Data represent the average ±SD from three independent expansion experiments. d Changes in cell number/ml from day 4 to day 8 after the thawing procedure. Data represent the average ±SD using four cryopreserved vials obtained from 4 different β-thalassemia patients