Fig. 1.

CXCR4 membrane surface expression on freshly purified CD34⁺ cells evaluated by flow cytometry. The samples were stained by irrelevant isotype matched mAb plus goat PE-conjugated polyclonal antimouse IgG antibody (a) or by anti-CXCR4 mAb followed by goat PE-conjugated polyclonal antimouse IgG Ab (b). A representative experiment is shown.