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Longitudinally sectioned basal body (bb) and cilium (c)
showing the transition zone between these two connected bodies. The
outer doublets of the axoneme arise directly from the microtubules of
the triplet microtubular fibers of the basal body (bb). One of
the singlet microtubules arises from an axosome (ax) at the
proximal end of the cilium and the second singlet arises somewhat
distal to this axosome. Electron opaque cross-sectioned kinetodesmal
fibers (kd) occupy the right (cell’s left) margins of the
longitudinally oriented ridges. (For three dimensional orientation see
Figure 23 in Allen, J Cell Biol. 49:1-20, 1971; also see Dute and
Kung, J. Cell Biol 78:451-464, 1978). gf, granulo-fibrillar
material; ee, early endosome; ep, epiplasm. Collidine
buffered fixative. EM taken on 5/21/70 by R. Allen with Hitachi HU11A
TEM. Neg. 27,500X. Bar = 0.2µm.
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