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. And then we take that phosphate and we add it onto this carbon. So the entire step of, the entire purpose of step six is to basically reduce our NAD and oxidize this PGAL. And so basically we add a second phosphate group and we create a destabilized molecule.