Electron micrographs show examples of pinocytosis in endothelial cells of blood vessels in the cat myocardium (panels A,B,C and H), and from the choroid rete of the bowfin fish eye. Both types of cells show finger-like projections (labeled as marginal folds) extending into the extracellular space, and an accumulation of vacuoles nearby. Figure 51 from Chapter 2 (Specializations of the Free Surface) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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