So once again, to review, let's take a look at the following numbers. So, number one basically describes we take our small peptide and we hydrolyze them at our protein enzymes found on the membrane of the apical side on the brush border. So we transform them into tripeptides, dipeptides and amino acid. Now, number two and number three basically describes the establishment of our electrochemical gradient. In the case for number two, we establish our sodium electrochemical gradient by using ATP to bring three sodium out, three sodiums outside, two potassiums inside, and that create a lower concentration of sodium inside, and that causes the sodium on the outside to travel inside in number three. And this brings exchanges and h and that flows outside to the lumen side, and that creates a high amount, high concentration of h on the lumen side and that establishes the hydrogen electrochemical gradient.