So this is the cytoplasm side, this is the lumen side, so the apical side, and this other side is the basil lateral side. It basically is in close proximity to our blood vessels. So before these amino acids enter our cytoplasm, we have to establish an electrochemical gradient for sodium ions. So on the basil lateral side, we have this sodium potassium ATPase pump. And what this pump does is it uses an ATP molecule. It breaks down ATP to ATP.