Now, other cells of our body, such as cardiac muscle cells and liver cells, use a slightly different shuttle process. And so in this lecture, I'd like to focus on a shuttle known as the malade aspartate shuttle. And the shuttle is used by cardiac muscle cells and liver cells to actually move the NADH molecules produced in the glycolytic pathway into the matrix of the mitochondria. So let's begin by examining the following diagram. So, in this diagram, we have the inner membrane of the mitochondria and we have the matrix side of the mitochondria. So this is essentially the cytoplasmic side.