And this is the same H atom that was initially attached onto carbon number one. And so we see that's how the carbon moves from carbon one to carbon number two as a result of this process. So in this process, the H is temporarily transferred onto the oxygen from carbon one. And then carbon two grabs that same HOA from that oxygen of this catalytic residue. And so, in the final step, we basically form this molecule, the aldos, our gap. And we also reform these two catalytic residues of the enzyme because, remember, enzymes are never actually used up at the end.