Now, Chimotrypsin cleaves our peptide at the carboxyl end of the bulky and aromatic amino acids. For example, tyrosine, phenylalanine and tryptophan, as well as methionine and leucine. Now you get three fragments as well. And once again, you isolate the three fragments and you sequence the amino acids in those three fragments by using the ethnic degradation process. And you find that fragment number one is lysine, aspartate, serene. Fragment number two is glycine tryptophan, and fragment number three is arginine and tyrosine.