Morphology of sorted CD34⁺ cells obtained from MPB. The regions R3 (CD38^−/low in A), R4 (CD38²⁺ in B), and R5 (CD38³⁺ in C) were stained with Wright Giemsa’s stain, visualized by light microscopy, and photographed at 1,000× magnification. Data show one representative experiment of six.