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A section serial to that of Figure 5 showing the four ciliary rows of
the quadrulus next to the cytopharynx’s left lip and the eight ciliary
rows of the two peniculi. A mass of endocytic vesicles and early
endosomes lies internal to the membranelles. This is one of the
primary sources of the carrier vesicles that bind to the microtubular
ribbons of the cytopharynx. Short ribbons of microtubules extend
laterally toward the plasma membrane from the dorsal row of the basal
bodies of the dorsal peniculus and from the dorsal row of the
quadrulus (arrows). In the peniculus these ribbons are
associated with nodes of the filamentous reticulum. Microtubules
(*) are also found in the space between the filamentous
reticulum (fr) and the alveolus (al) at the level of the
cytostomal cord (cc). It is not clear where these microtubules
arise, unless they represent the distal ends of the laterally oriented
ribbons which are sharply bent by the barrier imposed by the
filamentous reticulum that lies next to the alveoli. EM taken on
3/28/80 by R. Allen with Hitachi HU11A TEM. Neg. 7,000X. Bar = 1µm.
Part published in Eur. J. Cell Biol. 29:150-158, 1983.
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