Figure 3. Selected tomographic slices through the transition zone of a wild-type cell. (A) Proximal region of the transition zone contains doublet MTs and Y-shaped connectors (arrows). (B and C) First stellate fiber array (1) consists of a nine-pointed star containing a central hub formed from electron-dense triangular points. Distal tips of the transitional fibers form knobs that attach under the plasma membrane (C, ^*). (D) The first stellate fiber array is replaced by a central, amorphous disk (arrow). (E) A second stellate fiber array (2) at the distal end of the transition zone consists of a nine-pointed star with an elaborate center. (F) The two stellate fiber arrays (1, 2) look like an osmiophilic H in longitudinal view, separated by an electron-dense cross bar (arrow). Bar, 100 nm.

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