?:definition
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coenzyme composed of riboflavin 5\'-phosphate and adenosine 5\'-phosphate linked by a pyrophosphate bond; it forms the prosthetic group of many flavoprotein enzymes, serving as an electron carrier by being alternately oxidized (FAD) and reduced (FMNH2); important in electron transport in mitochondria and the endoplasmic reticulum.
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