Fig. 7.

Micrographs of structures similar to TNT. a A nanotube > 2.5 μm in length and 70–90 nm in diameter promoting direct contact between the cytosols of two adjacent cells is observed. b Membrane fusion (arrowhead) detail of (a). c A smaller filopodium (< 0.5 μm in length and 90–100 nm in diameter), where a structure similar to a clathrin-coated vesicle (arrow) can be seen endocytosing a viral particle. d Detail of the fusion membranes from two neighboring cell bodies (arrowheads) from c. Scale bars represent 0.2 μm in a–d