“Inserting Healthy Genes into the Picture” section of this
chapter, the scientist splices a healthy gene sequence into the virus to replace
the deleted parts of the viral genome. Like the delivery truck drivers that bring
packages to your doorstep, a helper is needed to move the payload from the
virus to the recipient cell. The scientist sets up another virus particle with
some of the deleted genes from the vector. This second virus, called a helper,
makes sure that the vector DNA replicates properly.
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