So in the final step, we want to reform this initial Thiamine Pyrophosphate in the protonated form. And so the H atom that was kicked off is basically picked up by this carbon atom to reform that protonated Thiamine pyrophosphate molecule. So we see that in this six step process, what ultimately happens is the transketulase uses that prosthetic group, the thymine pyrophosphate, to help transfer a two carbon group from the Xylose phyphosphate, the keto substrate, molecule two, that Aldo substrate, that ribose phyphosphate. In the process, we form two product molecules. We form the glycero aldehyde three phosphate, the Aldos product, and we form the seven carbon sugar molecules, cetohptulose seven phosphate, that keto's product. So we ultimately transfer that two carbon component from this section onto this section here to form these two product molecules.