Because if the body isn't able to shut off the pathway, that can lead to many different types of negative effects, for instance, cancer cells. And so there are two ways by which our body actually deactivates this process. Number one is because this process actually involves many kinases. So this is a kinase, these are kinases, these are kinases. Our body basically can reverse the effects of these kinases by using phosphatases. And so phosphatases are used by the body to basically remove those phosphoryl groups that were attached by these kinases.