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1. AMonoamine oxidase, found within mitochondrial membranes, is the primary enzyme for this second reaction
2. BCatalase, located within peroxisomes, is the principal enzyme responsible for this second reaction
3. CAlcohol dehydrogenase itself catalyses this second oxidation using the very same active site
4. DAldehyde dehydrogenase, concentrated within mitochondria, catalyses this second oxidative conversion
5. ECytochrome P450 2E1, an inducible microsomal enzyme, is the main route for this second reaction