Before using the CRISPR-Cas9 system to edit the pig genome,it is necessary to sequence the pig DNA to identify any copies of porcine endogenous retrovirus (PERV)DNA.Knowing the PERV DNA sequences will help researchers determine which ________ sequences to use as guides for the CRISPR-Cas9 complex.

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CRISPR-Cas9 utilizes RNA sequences as guides to target specific DNA sequences for editing. Knowing the PERV DNA sequences allows researchers to design the appropriate RNA guide sequences that the CRISPR-Cas9 system will use to find and edit the pig genome.

Before Using the CRISPR-Cas9 System to Edit the Pig Genome,it