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Fig. 5. (A) Transmission electron micrograph of the wall of a primary segmental
artery (sg.a.) showing the structure in a coil from an anastomosis. Here, the
vessel lumen is lined by a single endothelial cell (EC) on a continuous
basement membrane, and is typically only associated with a single smooth
muscle cell (SM). Scale bar, 10 µm. (B) This is also the case for secondary
vessels, which in all aspects have a structure quite similar to that of
primary vessels. Scale bar, 10 µm.