So we have the equalized cell membrane. Let's say this is the outside and this is the inside of the cell. So what these ecoly cells basically do is they break down fuel molecules. So they oxidize fuel molecules at the same exact time. When they use energy to break down these fuel molecules, they establish an electrochemical gradient of protons, hydrogen ions, and what they establish is a gradient in which we have a high outside concentration and a low inside concentration. And so what happens is we have this Simporter shown here in green, and it allows the spontaneous movement of these protons from the outside to the inside.