Distribution of human UCB CD34+, ALDHloLin-, or ALDHhiLin- sorted cells to the site of injury in NOD/SCID mice with AMI. AMI was induced in NOD/SCID mice by permanent ligation of the LAD. On the following day, animals were transplanted with 2 × 106 CD34+, 4 × 105 ALDHloLin-, or 4 × 105 ALDHhiLin- UCB cells labeled with QD655 fluorescent nanoparticles. Hearts were removed 48 hours post transplant and near infra-red images were recorded. (A) Anterior wall, (B) posterior wall. Values indicate relative fluorescent intensity. Value of the control is set at 1.