So as the pressure in the lungs falls below the systemic pressure, below the pressure inside our order, less blood flows via this constricted ductus arteriosis, and it eventually ceases to exist. So we see that within minutes, the Forayman Or valley closes. As a result, of the reversal and pressure between the right atrium and the left atrium. Then within hours, the darkness arteriosis constricts. And so eventually, the blood ceases to flow from the pulmonary trunk into the order. And finally, within days, as a result of that clamping process, the resistance inside the umbilical vein increases.