 that one, he takes the virus out of there, plucks it out, puts it into another flask with chick cells, and he's watching to see if it kills even more cells this time. And if it does, he takes it out, puts it into a flask again, and he's basically trying to get this thing to be better and better at killing chicken cells. And the idea here is... Oh yeah, sorry, you're about to answer my question, I think. Keep going. The idea is that by passing it through