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The genome of the human polyomavirus JC (Mad-1 strain) was molecularly cloned in Escherichia coli by using the plasmid vector pBR322. Recombinant DNA molecules were constructed with the entire JC genome inserted either at its unique EcoRI site at 0.0 map units or at its unique BamHI site at 0.51 map units. Viral DNA from each of these recombinant plasmids was capable of transforming human amnion cells, and cell lines established from transformed foci were positive for JC tumor antigen as assayed by indirect immunofluorescence.

Cloned human polyomavirus JC DNA can transform human amnion cells