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. And these ubiquitous molecules, which are also proteins, are not actually broken down. So in step one, we ultimately see the 19s subunit recognizes the target protein because of the polyubiquidination that happens on that target protein. It binds to it and inserts it into the 20s core for degradation.