A scientist used CRISPR-Cas9 to inactivate the pol gene for DNA polymerase in the porcine endogenous retrovirus (PERV)sequences of a pig embryo.The resulting pig embryo cells were then placed in proximity of human cells,but there was no infection of the human cells by the PERVs.Why were the PERVs no longer able to infect the human cells?

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The Answer of A scientist used CRISPR-Cas9 to inactivate the pol gene for DNA polymerase in the porcine endogenous retrovirus (PERV)sequences of a pig embryo.The resulting pig embryo cells were then placed in proximity of human cells,but there was no infection of the human cells by the PERVs.Why were the PERVs no longer able to infect the human cells?

A Scientist Used CRISPR-Cas9 to Inactivate the Pol Gene for DNA