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Abstract
Defective SV40 viruses were isolated from SV40-transformed monkey, human and hamster cells after Sendai virus-mediated fusion of the transformed cells with TC7 cells, a stable line of African green monkey kidney cells. Viral isolates were concentrated and purified and the defective viruses examined by electron microscopy. The buoyant densities in CsCl of the defective viruses ranged between 1.32 and 1.33 g/cc. DNA isolated from defective viruses was characterized by dye-buoyant density centrifugation and by velocity sedimentation in neutral CsCl. The DNA was heterogeneous in size and contained some covalently closed double-stranded circular molecules.
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