So in the parallel beta sheet, the adjacent strands run in the same direction, and an amino acid on one strand connects to two amino acids on the opposing strand via the hydrogen bond. So we see that not only do we have these opposing directions, but because in this case, we have the opposing directions, they line up perfectly. But in this case, because they run in the same direction, they don't line up perfectly. And so we have this type of one to two interaction as opposed to one to one in this case. Now, the final type of secondary structure that I'd like to discuss are the beta turns. So what do we mean by beta turn?