This is the n plus three amino acid, and so forth. Now, to actually stabilize the beta turn and to make sure that it is stabilized and exists for an extended period of time, we have to have a bond that forms between the co group. So, wow, this is an h, not an n. So if we examine the nth amino acid, the co group of the nth amino acid interacts with the NH group of the n plus three amino acid. And this is the hydrogen bond that stabilizes our beta turns. And these beta turns are usually found on the surface of that polypeptide. And what that means is these archains found on the beta turns are the ones that interact with the polar nature, the polar solvents found outside our protein as well as with the molecules, the macromolecules that interact with our protein in general.