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. So we take, for example, this mixture. We expose it to or this polypeptide chain. We expose it to proteolytic enzymes.