Figure 1. Identification of EPCs from human umbilical cord blood. (A) EPCs at passage 1 (P1) exhibited monolayer growth and cobblestone morphology after 2 weeks. (B) Cells were characterized by the immunofluorescence detection of CD31, CD34, VWF, VEGFR2, and CD133. (C) Flow cytometry revealed the positive expression rates of CD34, VEGFR2, and CD133. (D) Uptake of ac-LDL and binding of FITC-UEA-1 are characteristic functions of endothelial cells.