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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Vectors Uses for Animal Cell Culture
In case of Baculoviruses, the foreign gene

is inserted downstream of polyhedrin promoter
is inserted downstream of viral origin of replication
is inserted between the polyhedrin promoter and downstream sequences
is inserted randomly in viral genome

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