And so now the calcium ions end up on the other side, on the lumen side of the membrane. And notice we still have that phosphoryl group attached onto the blue domain. And so that P domain. And so this stage is known as the E two P. And notice it's called E two and not E one. So here we have E one, E one, e one and E one, because essentially this confirmation is still open to the cytoplasmic side of that membrane. But the E two means it is open to the other side, the lumen side of that membrane.