And there are four different types of regular patterns. We have alpha helixes, we have beta pleated sheets, we have beta turns, and we have omega loops. And these four different types of regular patterns compose the secondary structure of our protein, of our polypeptide. Now the question is, how exactly does the polypeptide begin to twist to form these four different types of structures? Well, inside the polypeptide, we have different bonds. Now, the peptide bonds are the bonds holding the amino acids inside the polypeptide together.