So the answer is these parietal cells, parietal cells are responsible for generating hydrochloric acid and releasing that hydrochloric acid into our ducks and ultimately into the lumen of the stomach. So parietal cells produce and secrete hydrochloric acid, which serves several important purposes. There are four purposes that you have to be familiar with. So, by releasing hydrochloric acid, we ultimately decrease the PH and increase the acidity of the lumen of the stomach. And that stimulates our chief cells to release our Pipsinogen into our stomach lumen. Secondly, it actually activates aropipcinogen, it transforms it into pepsin the active form of the enzyme it also denatures it breaks down the three dimensional shape of the protein into its primary sequence to basic and that basically allows our pepsin to actually cleave those bonds.