And so what the liver cells actually do is they phosphorylate the glucose on the 6th position and they use an enzyme known as hexacinase. So hexaginase takes a phosphoryl group from ATP and places it onto carbon six of glucose and that creates glucose six phosphate. Now, once glucose actually once glucose six phosphate is created, glucose phosphate then undergoes a reaction in which there is a transfer of the phosphoryl group from the six position to the first position of that glucose and we form glucose one phosphate. Now, the enzyme that catalyze this step is known as phosphorglucomutase. And what this enzyme does is the following. Inside the active side of this enzyme is a phosphorylated serine residue.