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Reactions catalyzed by PPOs. Top: o‐hydroxylation of monophenols to o‐diphenols (monophenolase activity, EC 1.14.18.1); bottom: oxidation of o‐diphenols to the corresponding o‐quinones (diphenolase activity, EC 1.10.3.1). TYRs catalyze both reactions, whereas COs catalyze only the diphenolase reaction.
