And so what happens at birth is we have a reversal in pressure taking place. Before birth, the right side of the heart was at a higher pressure than the left side. And what that means is the pulmonary system was at a higher pressure than the systemic circulatory system. But after birth, we have a reversal of pressure. The left side is at a higher pressure than the right side. And what that means is inside the order, inside the systemic circulatory system, we're going to have a higher pressure than inside the pulmonary circulatory system.