Expression of hematopoietic-specific cell surface antigens by CFU-ECs and ECFCs. Immunophenotyping of CFU-EC and ECFC colonies by confocal microscopy. CFU-ECs but not ECFCs express CD14 and CD45 (green). Photomicrographs are representative of 5 independent experiments using cells from different donors. Nuclei are stained with Hoechst 33342 (blue) and scale bar represents 200 μm.