Many of the most promising modern vaccines depend on viruses to transport genes into the body, and contain genes that directly alter the immune response.
(Many of the most promising modern vaccines; depend; on viruses) (Many of the most promising modern vaccines; contain; genes that directly alter the immune response) (genes; directly alter; the immune response)
Many of the most promising modern vaccines Many of the most promising modern vaccines genes
depend contain directly alter
on viruses
genes that directly alter the immune response
the immune response