Electron Microscopy of Sarcocystis fusiformis

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Abstract
Thin sections of cysts of Sarcocystis fusiformis were studied in situ in the myocardium [of cattle heart). Cysts were enclosed by a cyst wall. The external boundary of the cyst wall consisted of alternating long and short villous-like projections. Some long villi were seen within vacuoles in the surrounding myocardial cells. The basal portion of the cyst layer contained interwoven fibrils. The cells of S. fusiformis contained 3 regions. The anterior third contained sarconemes which seemed to originate in the conoid. The middle zone contained mitochondria and many bodies of various sizes, shapes, and electron density. The posterior portion of the cell contained a prominent nucleus, osmophilic bodies, and mitochondria.

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