Definition: Designation applied to ubiquinones with isoprenoid side chains consisting of variable numbers of isoprene units. CoQ mediates electron transfer between cytochromes b and c, and is chemically similar to vitamins E and K and to other tocopherols, quinones, and tocols. the length of the isoprenoid side chain distinguishes one type of CoQ from another; ubiquinone-10, the typical mammalian ubiquinone, has a side-chain of 10 isoprene units.
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Examples: glitazone, GI cocktail, etc.