Now this one three biphosoglycerate is also known as one three BPG. And then we take the one three BPG and we actually mix it with ADP as well as an enzyme known as phosphaglycerate kinase. And we transfer this phosphate group onto the ADP to produce our first ATP molecule as well as the three phosphorglycerate which also contains this phosphate group. Now in step eight we take this and we transform it into this molecule to phosphoglycerate by using an enzyme known as phosphoglycerate mutase. And what we do is we transfer this phosphate onto this section as shown, and then in step nine we have an elimination step taking place. So we basically we add an H onto this oxygen, onto this oxygen and then we basically kick off that water molecule that is produced as a result.