And that allows us to basically determine exactly what that sequence is of each one of these fragments. And then we repeat the process with a different proteolytic enzyme. And eventually we can basically find what the order is of these different fragments in that polypeptide chain. And then we repeat the process with this larger blue polypeptide chain. At the end, we basically are able to sequence what those amino acids are and how they're arranged in that polypeptide chain. So once again, once we isolate the two subunits, we can now determine what the sequence of amino acid is separately.