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Hundreds of axonemal dynein ATPase arms radiate from each of the nine
doublets of the cilium. Electron opaque densities occupy the center of
the basal body. Various bridging elements are found at both the distal
and proximal ends of the basal body and the proximal end of the
cilium. At the apex of the ridge is a gap (arrow) in the
epiplasm (ep), which is the name of the fibrous coat on the
cytosolic side of the inner alveolar membrane. al, alveolus;
ee, early endosome; kd, kinetodesmal fiber. Collidine
buffered fixative. EM taken on 5/21/70 by R. Allen with Hitachi HU11A
TEM. Neg. 23,000X. Bar = 0.2µm. Published in Paramecium, H.-P. Gortz,
ed., Springer-Verlag, Berlin, p.30, 1988.
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