SEARCH Articles Figures Tables Dioxygenase, enzyme reactions Dioxygenases Enzyme 1- Tryptophan 2,3-dioxygenase Enzyme 2,4-dioxygenase Enzyme 2,4-dioxygenase Enzyme anthranilate 1,2-dioxygenase Enzyme catechol 1,2-dioxygenase Enzymes catechol dioxygenases Heme dioxygenases catalytic enzymes