What is done is to splice the delivered gene (or its RNA precursor in an RNA virus) into the viral genome, so that when the virus penetrates the cell, the genetic material directly or ultimately delivered to the cell contains the corrective genetic material that one desires to be incorporated into the cell genome for therapeutic purposes.
(the genetic material; directly delivered; to the cell; that one desires to be incorporated into the cell genome for therapeutic purposes; T:when the virus penetrates the cell) (one desires; to be incorporated; into the cell genome; for therapeutic purposes) (the virus; penetrates; the cell)
the genetic material one desires the virus
directly delivered to be incorporated penetrates
to the cell that one desires to be incorporated into the cell genome for therapeutic purposes T:when the virus penetrates the cell
into the cell genome for therapeutic purposes
the cell