So we have 123-4567 and one of these, this one here at the end is a terminal non reducing residue. What that means is on the fourth carbon it contains a free hydroxyl group. And so now what this enzyme does is it cleaves this Alpha One four glycocitic bond and it basically detaches this entire segment. Now what it does next is it basically attaches it via an Alpha 16 glycocitic bond somewhere around this region. But it must attach it so that it exists at least four residues away from that preexisting branch. So if we count, for example, 1234, it has to create it on the fifth one here, it has to be four full glucose residues away from that preexisting one.