Levels of cd41:GFP mark differential populations of progenitor cells with varied proliferative capacity. (A) Schematic representation of CFU frequencies within the cd41:GFP+ combined L+P scatter fractions. (B) Schematic representation of the proliferation capacity of erythroid (BFU-E, CFU-E) and thrombocytic (CFU-T) progenitors assessed by counting of colony forming cells.