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Structure and redox states of coenzyme Q (CoQ). CoQ exists in 3 redox states: the fully oxidized form (CoQ) accepts 2 electrons to form CoQH2 or accepts 1 electron to form the ubisemiquinone intermediate, followed by acceptance of an additional electron to form CoQH2. The number of isoprene units in the tail varies between species from 6 to 10.
