How to Cut Out a Porcine Indogenous Retrovirus?

There are so many copies of per in the pig gina. We didnot know whether we can do so, ah, to achieve such a high efficiency without killing the pigs. But that only solves one part of the puzzle. Getting rid of the varers is to address the safety concern of our transmission. But the immune compatibility is another, a sothe problem. It's not bigger problem.