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NADH dehydrogenase molecule. Computer artwork showing the structure of a molecule of NADH dehydrogenase (NADH:ubiquinone reductase or Complex I). This respiratory enzyme is found in the mitochondria of human cells where it catalyses the transfer of electrons from NADH to coenzyme Q (CoQ). It is one of the 'entry enzymes' of oxidative phosphorylation in the mitochondria. (KEYSTONE/SCIENCE PHOTO LIBRARY/LAGUNA DESIGN)