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Strain HF (type 1) produces large plaques with a single flat polykaryocyte, whereas strain KY (type 2) produces small ones with round cells. Four recombinants were obtained by cross of HF X KY which possessed the characters intermediate between the parents with respect to plaque size and cytopathogenic effect. Further crosses between these recombinants produced HF-type virus. The crosses between the one recombinant and fresh isolates or mutant viruses also produced HF-type virus at different ratios.The occurrence of parental type by such the crosses suggests that plural genes are involved in the processes of polykaryocytosis by herpes simplex virus.
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Yamamoto et al. (1975) studied this question.
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