In the article “Critical Role of Macrophage 12/15-Lipoxygenase for Atherosclerosis in Apolipoprotein E–Deficient Mice” by Huo et al that appeared in the October 5, 2004, issue of the journal (Circulation. 2004;110:2024–2031), an error appeared in the legend of Figure 4. The following sentences should have been deleted: d, Serum-free cell medium conditioned by 12/15-LO+/+ macrophages slightly increased endothelial VCAM-1 expression. e, In presence of LDL, 12/15-LO+/+ macrophages cocultured with endothelial cells significantly increased expression of VCAM-1 on endothelial cells. n=4.