So this is the ATP. So we have our adenine base, the sugar component, and the triphosphate group. And so the reason we need that magnesium or the manganese, the reason we need a divulge positive metal ion is because the positive metal ion will interact with the negative charges on the oxygen molecule on the oxygen atoms of the triphosphate. And by interacting with the oxygen, they will create a conformational change in that substrate molecule. And by inducing that conformational change, they will create a shape. They will give the ATP molecule a shape that is appropriate for the shape of that active side.