So this is one tie junction, this is the second type of tie junction. What these Tie junctions basically do is they do not allow the lateral movement of integral proteins from our apical side, the lumen side of the cell membrane, to the basilateral side, the extracellular side of our cell membrane. Remember, inside an individual cell, inside the cell membrane, the phospholipids as well as the proteins are in a constant state of lateral motion. So our proteins can move around the cell. But when we have tie junctions, these integral proteins cannot actually go to this side of our cell membrane. And that's very important in basically controlling endositotic and exocytotic processes.