In the article, “Local Delivery of Marrow-Derived Stromal Cells Augments Collateral Perfusion Through Paracrine Mechanisms,” by Kinnaird et al, which appeared in the March 30, 2004, issue of the journal (Circulation. 2004;109:1543–1549), the authors incorrectly stated the number of animals assessed and the time point at which data were measured.
There were 6 mice, rather than the 8 indicated in the paper, in the mature aortic endothelial cell group (MAEC). Two animals died on day 14, resulting in only 4 animals being analyzed on day 14 and day 17. In addition, the final data were obtained on day 17, rather than day 21, as depicted in Figure 4.
There were actually 11 animals, not 10, in the control group (media group), and all animals survived to the final time-point. In the group injected with MSCs, the number of animals at baseline was 8, not 10, as reported previously. One animal died at day 1 and was not included in subsequent analyses, leaving 7 mice who survived to the end of the study. At the end of the study, day 17, only 5 animals could be included in the statistical analysis.