So in the second step, we were able to break that first peptide bond while keeping the other peptide bonds intact. And so now we have this labeled amino acid, the PTH Allamine, and this remaining polypeptide that now consists of five amino acids. And by using a chromatography technique and because this is labeled, we can separate this and then determine what this amino acid actually is. So the admin degradation process is very useful because it gives us a systematic approach to basically cleaving that first peptide bond and no other peptide bonds are cleaved within that polypeptide chain. Now the admin degradation process is even more useful. How?