Fig. Another example of endo- and exocytotic activity: smooth pinocytotic vesicles ("micropinosomes" - arrow) in endothelium (E) of a blood vessel. B - basal lamina, C - perivascular collagen. Transcytosis is apparent (arrows) in the lower figure, in the vesicles darkly stained with ruthenium red. L - lumen of the blood vessel. Scale = 500 nm. (Human, sural nerve; mouse, thalamus). Download the high resolution image (a); Download the high resolution image (b).