And one very important process in which we modify sugar molecules is in the process of glucose metabolism, as we'll see briefly in just a moment. So there are two modifications of sugars that we're going to focus on in this lecture. We're going to begin by discussing phosphorylation of sugars and then we're going to move on to glycosidation of sugars. So whenever our cells actually uptake sugar molecules, the first step in the breakdown of glucose in glucose metabolism is to phosphorylate glucose, is to basically transform the glucose into glucose six phosphates. So on the reactant side, we have the beta anomer of the cyclic form of glucose. So we have carbon 12345 and six.