So we have three of these different subunits and they exist in different states. And that's a result of the orientation of this central gamma structure that exists in the central cavity of that Hexima ring. So once again and let's summarize the following diagram and this entire mechanism by which this takes place is known as the binding change mechanism. So in reaction one, a rotation of the gamma subunit of 120 degrees in a counter clockwise direction. So when this arrow basically moves here 120 degrees, what happens is this structure here in the 10th state changes into the open confirmation the open state. So we see the rotation basically converts the beta subunit in the 10th state into the open state and the other units are also transformed.