And in process three, once the ATP is released a new set of ADP Orthophiletate will enter that open beta subunit. And once they enter, if we have another rotation so if this structure rotates 120 degrees again this way then this open will become a loose state. And once in a loose state these two reactants will become trapped within this beta subunit. So another rotation of 120 degrees in the counterclockwise direction, which is not shown in this diagram, will lock the reactants, the ADP and the pi in this state and they will not be able to leave this structure. And so this mechanism is what we call the binding change mechanism. Now, what we're going to focus on in the next lecture is how the third step actually takes place.