Then we have a peptide bond shown in green. We have amino acid number two, a second peptide bond, amino acid number three, a third peptide bond, amino acid number four, a fourth peptide bond, and amino acid number five. And these amino acids in a polypeptide are also known as residues. So we have residue one, residue two, and so forth. So notice we have five amino acids, but only four peptide bonds. And normally, if we have, let's say, N number of amino acids, we always have N minus one number of peptide bonds.