And as we discussed previously, when we discussed the kinase molecule, so NMP kinase inside our body, we have many different types of protein kinases which are used to basically catalyze the transfer of a phosphoryl group from our ATP molecule onto that particular enzyme. And by transferring that phosphoryl group, that can basically activate or inactivate the activity of that enzyme. Now the reverse process. The removal of that phosphoryl group from that enzyme is catalyzed by a different enzyme known as protein Phosphotase. And we'll discuss this protein in much more detail in a future lecture. So we essentially have the enzyme and the ATP molecule.