And this stage is known as the E one P, where P is the first world calcium two ADP. Now, in the next stage, as the ADP begins to exit, so the ADP detaches. As it detaches, that creates a conformational change in the structure of that domain. And so what happens? That domain basically inverts. It opens up to the other side of the membrane and that allows these calcium ions to actually exit that particular transmembrane region.