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Sections cut perpendicular to that of Figure 28 show the origin of
one cytopharyngeal ribbon of 12 microtubules from the nodes and show
the tight curve the ribbon follows over the cytostomal cord
(cc). These ribbons move discoidal vesicles (disc),
acidosomes (ac) and carrier vesicles along one of their
surfaces. Carrier vesicles (cav) are most abundant under the
quadrulus where they arise from early endosomes and where the highest
concentration of parasomal sacs and early endosomes occurs within the
cell. These vesicles rapidly fuse with acidosomes. The acidosomes then
dock at the membrane of the nascent phagosome. qar, quadrulus
associated ribbon. EM taken on 4/10/74 by R. Allen with Hitachi HU11A
TEM. Neg. 12,750X. Bar = 0.5µm. Published in Poste and Nicolson (eds.)
Membrane Fusion, Elsevier/North Holland Biomed. Press, p.735, 1978 and
in J. Cell Biol. 63:904-922, 1971.
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