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(a) Images of EPC colony-forming units (right 10×, left 20×). Mononuclear cells were preplated for 2 days to remove the population of fast-adhering, already differentiated cells. Pictures show representative colonies on day 6 after plating of the nonadherent cell fraction in culture. Representative flow cytometric analyses of cells positive for CD34/VEGFR-2 (b) and CD34/CD115 (c) antigen after 6 days in culture are shown.
