And at the same time, this pumps our age to the outside of the cell. So this membrane protein is known as the sodium hydrogen exchange protein. So it exchanges one sodium for one hydrogen. Now, the reason for that is because we also want to establish a hydrogen ion gradient, a proton electron gradient, so that we build a higher concentration of h on the outside, on the lumen side than inside the cytoplasm. And what that allows us to do is it allows this other membrane protein, known as the hydrogen ion dependent cotransporter protein, as these h ions rush into the cell down their electrochemical gradient, that was established as a result of these two protein, protein integral proteins, the tripeptides and the dipeptides, also travel with these h ions. So it's the sodium that brings the amino acids in, but it's the hydrogen that brings the tripeptite and dipeptides into our cell.