Vectors Uses for Animal Cell Culture
Cos cell line is

derivative of non-permissive CV-1 monkey cell line
cohesive initial site of phage λ
derivative of permissive CV-1 monkey cell line
cohesive end site of phage λ

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

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

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