And if we push against that valve system, it essentially opens up. And so because of the higher pressure, it pushes against this forraminal valley, the valve, and it basically pops open and the blood flows into the left atrium of the heart. And as a result, what that means is the partially oxygenated blood is able to actually bypass those nonfunctional high pressure lungs. Now, of course, a tiny amount of that blood will still get into the right ventricle of the heart. So a portion of that blood does, in fact, move into the right ventricle of the heart. And actually that's important because when that heart of that fetus is developing, we have to be able to develop the wall of those ventricles.