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This micrograph shows that the discoidal vesicles meet the
cytopharyngeal membrane edge-on where they fuse (arrow).
Besides the ribbon of 12 microtubules abutting the membrane there is a
second small ribbon of 2 or 3 microtubules lying against the
cytopharyngeal membrane on the posterior side of each ribbon. This
narrow ribbon does not curve away from the membrane but remains close
to the membrane and its termination marks the boundary line between
the cytopharynx and the nascent vacuole membrane. ps, parasomal
sac. EM taken on 7/27/73 by R. Allen with Hitachi HU11A TEM. Neg.
12,750X. Bar = 0.5µm. Published in J. Cell Biol. 63:904-922, 1974.
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