So this is a single mitochondrion. In the mitochondrion, we have several compartments. We actually have two different membranes. We have an outer mitochondrial membrane and the inner mitochondrial membrane. And this electron transport chain is found on the inner mitochondrial membrane that consists this folding pattern known as Christie that we're going to focus on in just a moment. So let's zoom in on a small section of the inner mitochondrial membrane, this is what we're going to find.