Transmission electron micrograph of mouse capillary intestine fenestrated endothelium with hemoglobin in the lumen lumen. The capillary lumen filled with hemoglobin shows continuities across endothelium. Image made available by James D. Jamieson and the Department of Cell Biology, Yale University School of Medicine.
Reference: Simeonescu, N., M. Simeonescu, and G. E. Palade. 1975. J. Cell Biol. 64:586-607. Original 3.25 in. x 4 in. lantern slides were scanned at 600dpi. Original magnification x14,800