A recent publication in Blood by Balazs et al. (2006), demonstrates that mouse bone marrow cells isolated based on Endothelial Protein C Receptor (EPCR) expression alone displayed greater in vivo repopulation activity than cells isolated with traditional hematopoietic stem cell markers (Lin^-, Sca1⁺, c-kit⁺, SP). EPCR protein expression has been detected on roughly 1.5% of mouse bone marrow cells. Both purified and biotinylated EPCR antibodies are offered for the detection of these cells.