And we also form that reducing ancient molecule that can be used by the cell in a variety of different ways. Now, once we form the ribulous phosphate, we have the final reaction taking place that is really an isomerization reaction in which we have the enzyme phosphatentose. Isomerase basically transforms this keto ribulase phosphate into an aldos, the derivose phyphosphate. So the derivulose phosphate is transformed to the derivose phyphosphate via the activity of phosphorpentose isomerate. So we see that in the first phase of the pentose phosphate pathway, we basically have four steps. In step one, we undergo an oxidative reaction, an oxidation reduction reaction, which we generate that first NADPH molecule.