But as soon as the first breath is taken, the pressure inside the right atrium drops, the pressure inside the left atrium increases. And so we have a reversal of the pressure differential. And now, because the pressure on the left side of the atrium is greater, it will create a force that will point in this direction and that will close, shut this for a minute or valley. And eventually what happens is this basically forms a closure and this also forms a closure. And so this is basically shut close. So following birth, there is a reversal of the pressure differential.