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. So that means inside the cell, we have a low concentration of sodium. And on the outside, we have a higher amount of sodium. So that means because we have a higher amount of sodium on the lumen side, the sodium will travel into the cell via this special type of co transporter protein.