Heme oxygenase, or haem oxygenase, (HMOX, commonly abbreviated as HO) is an enzyme that catalyzes the degradation of heme to produce biliverdin, ferrous iron, and carbon monoxide.

Enzyme catalyzing tryptophan to N-formylkynurenine.

Inositol oxygenase, also commonly referred to as myo-inositol oxygenase, is a non-heme di-iron enzyme that oxidizes myo-inositol to glucuronic acid.

Enzyme that produces prostaglandins, thromboxanes.