Multi-lineage human engraftment in selected organs in NOD/SCID β2m null mice four weeks after transplantation of ALDHhi Lin- sorted human UCB cells. NOD/SCID β2m null mice with AMI were transplanted with ALDHhiLin- sorted human UCB cells. The lineage of human engrafting cells in selected organs was assessed by double staining for human-specific β2m and CD45 (A-L) or CD31 (M-P) four weeks post transplantation. (A-D) Lung, (E-H) Kidney, (I-L) Spleen, (M-P) Lung. Nuclei: blue, CD45 and CD31: green, β2m: red. Scale bar represents 25 μm.