We also release the H plus ion as in step number three. Now let's move on to step number five. In step number five, we basically transfer a phosphate group from the succinil coenzyme A onto the GDP, where GDP is basically guanosine diphosphate, and we form our guanosine triphosphate. So we see that this is the only step in the citric acid cycle in which we actually produce a high phosphoryl transfer potential molecule basically our GTP. And that GTP is ultimately transformed into an ATP molecule via an enzymatic reaction. So I label these three steps as stage number two.