“Our investigations also demonstrated that AZT, d4T, and 3TC did … of the 11 polypeptides encoded by mitochondrial DNA, while ddC caused … polypeptide content and ddI reduced by 43% the total content of 8 polypeptides (including NADH …, 2, 4, and 5, cytochromec oxidase subunits I to III, and cytochrome b).”