text:  of bringing in a whole gene. So CRISPR, for example, that is what's really good at knocking genes out. So you can make mutations really easily. So if you've got a gene that you want to get rid of, CRISPR is perfect for that. But when it comes to bringing in a replacement gene, like what I'm talking about, CRISPR is not very good at that in the body. So you can do it in the lab. I can do that in my lab. I've got cells that are dividing the