And so only those amino acids that have relatively small side chain groups and which are nonpolar so uncharged, will be able to fit into this pocket. And so we see that Elastase cleaves peptide bonds on the carboxyl end of small hydrophobic amino acids such as glycine, vallene, Alanine, Valine, Alanine Leucine and Isolucine, as well as serene. So if we have this hypothetical polypeptide chain, we have glycine, lysine, Alanine, phenylalanine, glycine. So the only ones which have a small hydrophobic side chain are glycine Alamine, as well as glycine at the end. So the only two peptide bonds that are going to be cleaved are this peptide bond. So on the carboxyl end of glycine, as well as this one on the carboxyl end of Alanine.