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The steady‐state transport of cationized ferritin by endothelial cell vesicles

1. The steady‐state transfer of cationized ferritin by endothelial cell vesicles has been investigated quantitatively using electron microscopy. Single capillaries from the mesenteries of decerebrated frogs were perfused in vivo with solutions containing 3‐5 g 100 ml−1 cationized ferritin or cationized ferritin (3‐5 g 100 ml−1) and bovine albumin (1 g 100 ml−1). Perfusions lasted between 60 and 240 s, at which time the tissues were fixed in situ with osmium tetroxide.