And actually it contains a few EF hands. So if you want to see the structure of calmodulen, look it up on Google or in a textbook. It basically contains these EF hands. And the reason we call it a hand is because it kind of looks like this, where this purple alpha helix is this structure here, this a dark purple region is this structure, and this green section is my thumb. And so it kind of looks like a hand. And so this pocket here that is formed as a result of this loop, this loop and this turn is basically where that calcium ion actually fits.