So the oxalo acetate cannot cross the mitochondrial membrane. Therefore, to return back to the matrix, it is first transformed into malade by malade dehydrogenase. And this requires NADH. And so we produce NAD plus in this process. Now, once we form malade, an important process takes place that allows us not only to form the pyruvate that can now move across the matrix, across the membrane of the mitochondria, but we also generate NADPH and NADPH. And this is important, as we'll see in just a moment, because this is the NADPH that we're going to use in the fatty acid synthesis process.