Multi-organ engraftment in NOD/SCID β2m null mice four weeks after transplantation of ALDHhiLin- sorted human UCB cells. NOD/SCID β2m null mice with AMI were transplanted with ALDHhiLin- sorted human UCB cells and human engraftment in multiple organs was assessed by staining for human specific β2m four weeks post transplant. (A) Spleen, (B) lung, (C) liver, (D) kidney, (E) heart, (F) liver. Nuclei: blue, β2m: red. Scale bar represents 25 μm.