And the other side is the basil lateral side. It points towards our blood vessels. So on the basil lateral side, we have an important type of transport protein known as sodium, potassium, Atpas. And this is basically a pump that hydrolyzes uses ATP, transforms it into ATP, and at the same time, it pumps three sodium ions against its electrochemical gradient out of the cell to the basilateral side. At the same time, it pumps two potassium into the cell. And over time, this establishes an electrochemical gradient inside the cell.