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Transformation in vitro by SV40 parental and recombinant viruses. Primary mouse embryo fibroblasts were infected at 10 PFU per cell. Replicate plates were stained, and transformed foci were counted at 3 and 6 weeks p.i. The relative numbers of transformed foci are plotted and normalized to the value for strain 776(2E) at 3 weeks. Bay(1E), Baylor(1E).
