Common endothelial progenitor cell assays identify discrete endothelial progenitor cell populations

Endothelial progenitor cells can be broadly classified into 2 classes: VEGFR-2-expressing cells, which give rise to endothelial CFUs, and CD133/CD34 or ALDHbr cells. These observations underscore the need for better assay standardization and a more precise definition of EPCs in cell therapy research.