induction studies with mutant strains each defective in an enzyme of the pathway showed that 4-hydroxyphenylacetate induced the hydroxylase and that 3,4-dihydroxyphenylacetate induced the 2,3-oxygenase , aldehyde dehydrogenase , isomerase , decarboxylase , and hydratase .
C0020364
hydroxylase
C0030065
oxygenase