Now, what this antiporter basically does is it allows these purple molecules to naturally move down its electrochemical gradient. So from the high concentration to the low concentration. And this doesn't actually require energy. In fact, it gives off energy and that free energy that is given off when the purple molecules move down, their electrochemical gradient is captured and is used to basically move these other molecules. So we have these orange molecules against their electrochemical gradient. So we move them from the inside to the outside.