So we basically form the PTH arginine. And then we isolate that and determine what that amino acid is. And then we take this four membered amino acid polypeptide, and then we repeat the admin degradation process a third time, then a fourth time and a fifth time. And at the end, we basically know exactly what that sequence of amino acid is in our polypeptide chain. So this process is a very, very useful process because it gives us a systematic approach to cleaving a specific peptide bond and thereby determining exactly what that sequence is. Now, the edgeman degradation process is only useful up to a certain size of that protein.