Vectors Uses for Animal Cell Culture
Using bovine papilloma virus (BPV) derived vectors, permanent cell lines can be obtained carrying a recombinant DNA

either episomally or integrated at low copy number
integrated only
episomally only
either episomally or integrated at high copy number

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Vectors Uses for Animal Cell Culture
Retroviruses have advantage for being used as vector for animal cells because

infection does not lead to cell death, infected cells produce virus over an indefinite period
viral gene expression is driven by strong promoters
All of these
they cover a wide host range

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