So this peptide here is this peptide here. So we have arginine, we have phenylalanine, we have glycine, we have aspartate, and we have glycine. So we take this, we mix it with our phenol isotiocyanate, we label it in step one, and in step two, we remove it. 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.