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By Nils R. Ringertz and Robert E. Savage (Auth.)

ISBN-10: 0125891504

ISBN-13: 9780125891509

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I. Ishida and his colleagues at Tohoku University School of Medicine in Sendai, Japan. , 1960) (Fig. IV-1). The membranous character of the envelope stems from the fact that as Sendai virus particles leave a parasitized host cell, they are surrounded by a piece of the plasma membrane. Electron micrographs show filamentous or, more commonly, spheroid protrusions of host cell mem- A. , Blough, 1964; Howe et al, 1967). Moreover, Rott et al (1966) showed that when glycolipid and glycoprotein antigens (blood group substances A, B, F, H, Forssman, and mononucleosis antigens) were found on host cells, myxovirus liberated from these cells exhibited the same serologically defined membrane structures.

These polykaryons are also the result of cell fusion; stem cells which otherwise line the surface of resting bone seem to be the precursor line for osteoclasts (Ham, 1974). 3. Possible Fusion of Erythroid Cells The examples of fusion presented in the preceding pages constitute instances of cell fusion which seem to be genetically programmed for in mammals. Although they generate polykaryons, they are not normally events which lead to hybrid cells. There exist, though, a few reports which suggest that from time to time there are chance intercellular fusions which do generate hybrid cells.

But within a set of standard conditions there seems to be greater susceptibility of malignant cells to nonmalignant, established culture lines to primary or secondary cultures, and "younger" cells to "older" cells in any given passage level of culture [see Poste (1970) for a review of these generalizations and their exceptions]. The behavior of host cells in mixed cultures also plays a role in the frequency of homokaryon versus heterokaryon generations. , Moscona, 1966). Such histiotypic aggregation occurs even across B.

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Cell Hybrids by Nils R. Ringertz and Robert E. Savage (Auth.)

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