Endothelial progenitor cells are known to exist in the adult bone marrow. Endothelial cells line the interior of all blood vessels and are typically one of the most quiescent cell types in the body. Endothelial cells express a number of CD antigens including CD31, CD34, CD309/Flk-1, CD202b/Tie2, and CD144/VE-Cadherin. These molecules and related antibodies may be valuable tools for endothelial cell isolation and characterization. Sino Biological Inc offers a range of quality products for the identification and characterization of specific endothelial cell types.