Serial section to Figure 21 at higher magnification. In this
micrograph the two acidosomes (ac) seem to be attached to the
posterior side of the ribbon. The discoidal vesicles maintain a
distance of 40nm from the ribbon which represents the length of
cytoplasmic dynein arms. We reported that in Paramecium
vesicles move in one direction along one side of the ribbons and in
the opposite direction on the reverse side (Schroeder, Fok and Allen,
J. Cell Biol. 111:2553-2562, 1990). EM taken on 8/16/80 by R. Allen
with Hitachi HU11A TEM. Neg. 12,250X. Bar = 0.5µm. Published in
Paramecium, H.-D. Gortz, Springer-Verlag, Berlin, p.320, 1988.
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