ID 1.3.3.8 DE Tetrahydroberberine oxidase. AN THB oxidase. CA (S)-tetrahydroberberine + 2 O(2) = berberine + 2 H(2)O(2). CF Flavoprotein. CC -!- (R)-tetrahydroberberines are not oxidized. CC -!- Formerly EC 1.5.3.8. //