Erratum in: Cover legend ( Invest Ophthalmol Vis Sci. May 2008, Volume 49, Number 5).
The cover legend should read, “Area in the temporal retina of a 22-week gestation fetal human retina that was incubated with anti-CD39 (red). CD39 (ecto-ADPase) labels angioblasts and endothelial cells in the developing retinal vasculature. Angioblasts and endothelial cells in vascular cords also express CXCR4 (not shown in this image), which can be seen double labeled (red/green) in this same specimen in Figure 11 in Hasegawa et al. on page 2178 of this issue.”