Here 's an answer by George Church: > A: It struck me as bold choice to do CCR5. In some ways it doesn’t make sense, but in another way it makes more sense tha

Here 's an answer by George Church: > A: It struck me as bold choice to do CCR5. In some ways it doesn’t make sense, but in another way it makes more sense than β-thalassemia or sickle cell, both of which you can prevent with preimplantation genetic diagnosis. [These genetic diseases are two prime targets of many CRISPR researchers.] The real issue is what’s the best first case.