Proliferative capacity of CFU-TEs, BFU-Es, CFU-Es, and CFU-Ts. (A) Fluorescent photomicrographs of colonies grown in methylcellulose for 4 days and their categorization according to their proliferation capacity (size) and expression of cd41:GFP and gata1:dsRed. Photomicrographs were taken at original magnification ×200; scale bar represents 50 µm. (B) Proliferation capacity of BFU-Es, CFU-Es, and CFU-Ts assessed by cell counts of isolated colonies. (C) Proliferation capacity of WKM cells, grown in suspension with combination of recombinant Epo or Tpo protein added assessed by the division-mediated dilution of membrane dye PKH26.