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Fig. 9: myonemal layer bordered by ER

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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