. Electron-microscopic structure of protozoa . Text-figure 5. Schematic drawing of Sarcocystis tenella. Polar ring and conoid enlarged at upper right, cross-section through anterior body region at lower right. C, conoid; CV, unidentified low-density vesicles; CG, dense granules of the central body zone; F, longitudinal fibers beneath the pellicle; M, mitochondria; N, nucleus; n, nucleolus; P, polar ring; S, fibers filling the anterior third of the body; V, vesicles in the posterior cytoplasm. From Ludvik, 1958.

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