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. Now, the majority of dipeptides and tripeptites in the cell are converted, are broken down into their amino acid constituents. And then these amino acids, as well as a few dipeptides and tripepptides, basically travel via special protein proteins found in the membrane of the basil lateral side. So these proteins can either be our proteins that allow passive diffusion or passive transport, or they can also be those proteins that are co transported.