Well, let's take a look at the following two molecules. So once we isolate this molecule and remove it, we have this peptide bond left. Now, we don't know what the sequence is of these other amino acids. And so what we can actually do is if the polypeptide isn't too long as it is in this case, so if it's about 50 amino acids or less, we can actually continue that Edmund degradation process. We can repeat it over and over and over until we get every one of these amino acids. So if we take this five amino acid polypeptide and we repeat the Edmund degradation process again, then we'll be able to remove this amino acid here, which is arginine.