Proposed transformation of different di- and trichlorotoluenes by tetrachlorobenzene dioxygenase TecA and dehydrogenase TecB. Substrates: A, 23DCT; B, 24DCT; C, 25DCT; D, 26DCT; E, 34DCT; F, 35DCT; G, 245TCT. ➞, major reaction catalyzed by TecA; →, minor reaction catalyzed by TecA; ➩, reaction catalyzed by TecB.