But organisms from humans to algae also have another clock that doesn't rely on rhythmic gene expression to keep time, but instead uses the rise and fall of the reactive oxygen molecules that are formed as natural byproducts of metabolism. (sciencedaily.com)
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Though free radicals are completely natural byproducts of normal, healthy metabolic processes, they are highly reactive — they steal electrons from many of the particles they come into contact with. (petconsider.com)