The plasmids that are used to express the retroviral proteins in the packaging cell lines contain the packaging signal ($\Psi$).

Name: The plasmids that are used to express the retroviral proteins in the packaging cell lines contain the packaging signal ($\Psi$).
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The plasmids used to express retroviral proteins in packaging cell lines do not contain the packaging signal (ψ), as this would lead to the packaging of the plasmid itself into viral particles, which is not desired.

The Plasmids That Are Used to Express the Retroviral Proteins Ψ\PsiΨ

The Plasmids That Are Used to Express the Retroviral Proteins $\Psi$