And pepsin is that protein, the enzyme, the proteolytic enzyme found in the stomach that is responsible for breaking down the protein into smaller polypeptides. And unlike these mucous cells, the chief cells are found lower within our duck region. So these purple cells are the cheap cells. Now, let's move on to our parietal cells. So, earlier we mentioned that the stomach has a very low PH. So when we have a full stomach and we have digestion taking place, the PH is around two.