Now, let's take any one of these amino acids. So let's suppose this amino acid here, and this happens to be the tyrosine because this is the side chain group of tyrosine. Now, this C carbon here is the central carbon atom. This side is the carboxyl side. So the right side is the carboxyl side, and this is that carboxyl peptide bond, while the other side is the amino side. And this is that amino peptide bond.