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Characteristic of endothelial progenitor cells (EPCs). (a) Cobblestone-like morphology of EPC colony appeared after 7 days of culture (scale bar = 500 μm). (b) Capillary-like structures derived from EPCs after culture on Matrigel for 24 hours (scale bar = 200 μm). (c) Immunophenotype of EPCs as determined by flow cytometry.
