Abstract

THE presence of parallel arrays of thin lamellae clustered in bundles in the cytoplasm of some tumour cells containing Shope fibroma virus has been depicted by Bernhard et al. 1. Fawcett2 has observed irregular, coarse bundles of dense filaments in the cytoplasm of virus-containing tumour cells of the Lucke renal adenocarcinoma. Morgan et al. 3, reviewing their earlier micrographs of chick chorioallantois infected with fowl pox, found clusters of dense filaments, indistinguishable from those described by Bernhard, in the cytoplasm of ectodermal cells containing virus particles4. More recently, Reczko5 has demonstrated the presence of groups of lamellae in the epithelial cells of guinea pig peritoneum infected with swine pox virus. In electron micrographs of sections of chick chorioallantoic membranes infected with ectromelia virus, bundles of filaments have been observed in association with intra-cytoplasmic virus inclusion bodies.

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