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The layer of myonemes in O. coarctata covers most of the
cytosolic side of the pellicle. Pellicular pores (pp) penetrate
through this sheet. The ER is spread out against this sheet and,
besides having decorated tubules, it bears thinner rails that lie
between the ER and the myonemes and spindle-shaped mid pieces
(arrowheads). For a description of these rails and mid pieces
as they are found in peritrichs, see Allen, J. Cell Biol. 56, 559-579,
1978 and J. Protozool. 20, 25-36, 1973. Their function still remains
to be determined. EM taken on 6/7/69 by R. Allen with Philips 300 TEM.
Neg. 14,800X. Bar = 0.5µm.
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