So stage three itself involves five individual steps, and this is the process where we produce our ATP molecules as well as the water molecules and our NADH molecules. So let's begin with stage three. And we begin with the PGAL molecule that we form in stage two. So we take the PGAL and we basically reacted with a special type of enzyme known as glyceroaldehyde three phosphate dehydrogenates. And this enzyme basically uses an NAD cofactor as well as API, which is our phosphate, and it produces the one three biphosphoglyceride. So basically, we reduce the NAD plus into NADH by taking this H from the PGAL and transferring onto the NAD.