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Cell sectioned perpendicular to the surface. The parasomal sac ends
internally as a coated pit (cop), coated with clathrin. Where
the coated pit has pinched off a clathrin-coated vesicle (cov)
is formed. When the clathrin is removed an endosome (e)
results. Other clathrin-coated vesicles (arrow) arise from
early endosomes. kd, kinetodesmal fibers in cross section;
il, infraciliary lattice fiber. Collidine-buffered fixative. EM
taken on 5/21/70 by R. Allen with Hitachi HU11A TEM. Neg. 27,750X. Bar
= 0.2µm. Partly published in J. Cell Sci. 101:449-461, 1992.
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