So in this particular case I've drawn ten. So we have 1234-5678, 910 of these orange structures and these ten C units basically organize themselves to form this ring structure which acts as a channel to allow the movement of those protons. So the ten to 14 C subunits organized into a ring structure that act as a proton channel. It ultimately allows the hydrogen ions to flow from the intermembrane space and into the matrix down their electrochemical gradients. Now we also have this A subunit that is shown here and the A subunit basically lies on the outer portion of this C ring structure. And the A subune also plays a role in helping move those protons along the membrane, across the membrane, the inner membrane of the mitochondria.