Cardiac function of NOD/SCID β2m null mice with AMI four weeks after transplantation of ALDHlo Lin- or ALDHhi Lin- sorted human UCB cells or PBS. NOD/SCID β2m null mice with AMI were transplanted with ALDHloLin- (Red square) or ALDHhiLin- (Green triangle) sorted human UCB cells or PBS (Blue diamond). Echocardiographic images were recorded on the day of transplantation (day 0) and again at day 7 and day 28. Segmental wall motion scoring index (A), end diastolic volume (B), end systolic volume (C), and ejection fraction (D) were determined. Data points indicate mean values and standard error.