“…Flavins are present in over 100 different enzymes, usually in the form of either flavin mononucleotide (FMN) or flavin adenine dinucleotide (FAD), but covalently modified in some 10% of cases. , Flavins are at the catalytic or conformational core of dehydrogenases, , oxidases, , oxygenases, electron carriers, , hydrolases, − light-responsive sensors, − light-driven DNA repair, , fuel-producing decarboxylases, dehalogenases, and even magnetosensory navigational systems . Given the extreme versatility of flavins, the second marvel is how individual proteins manage to emphasize a specific activity.…”