And so we basically take the gap, we mix it with our NAD plus and we also use an orthophosphate. And in the presence of gap dehydrogenase, so dehydrogenase basically means we're going to have a reaction which there will be a transfer of a Hydride group. And so this will be reduced into NADH. We're going to release an H ion and that phosphate. The orthophosphate will basically attack this molecule and bind onto this carbon here. And so now we have these two phosphate groups on this molecule.