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Fig. 11: atrial rods and filaments in oral region

Rods exhibit periodicity along their individual microtubules. Discoidal vesicles seem to be bound to the rod surfaces (arrows). Bundles of filaments (fil) penetrate into the food vacuole forming zone from the bases of the basal bodies. bact, symbiotic bacterium; m, mitochondrion; mu, mucocyst. EM taken on 5/22/69 by R. Allen with Philips 300 TEM. Neg. 14,800X. Bar = 0.5µm.
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