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. Now, in number four, we have a co transport system that uses the movement of sodium into the cell down its electrochemical gradient to bring the amino acids in. But in number five, we use the hydrogen to bring our tripepptides and dipeptides into the cell. As these h move down their electrochemical gradient, these tripeptides and dipeptides also move into our cell.