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Fig. 7. Possible ultrastructural counterparts of the endocytosed vesicles of TJs, as observed by electron microscopy. Confluent sheets of Eph4 cells were cut tangentially to the apical surface of cells, and the area around the belt of TJs (arrows) was closely observed. Boxed areas in the left panels are enlarged in the corresponding right panels. These vesicles were characterized by double membranes with no gaps. Bars, 200 nm (left panels); 40 nm (right panels).