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
either episomally or integrated at high copy number
episomally only

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

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

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