And only then can the 19th subunit begin to use its Atpa's activity to basically unfold the protein and insert the protein into this core. And inside this core, we'll find these catalytic units that basically have nuclear files. And these nuclear files attack the peptide bonds and begin to break down the protein into smaller peptides. Now, this process continues until we form peptides that are about seven to nine amino acids in length. At that point we begin to remove those ubiquitous molecules. And eventually, once all that takes place, those peptides shown here are released along with our ubiquitous molecules.