Microanatomic distribution of normal donor cells in irradiated Sl/Sl^d recipients. Transplanted HSCs display a qualitatively similar preferential lodging to endosteal regions in irradiated Sl/Sl^d recipients (blue: DAPI, green: CFSE-labeled wild-type HSCs, red: anti-CD31, top panel: tibia, bottom panel: femur), as normal cells do.