An enzyme extractable from various strains of DDT-resistant houseflies catalyzes the dehydrochlorination of DDT to form a nontoxic product [1,1 -dichloro-2,2-bis(p-chlorophenyljethylene]. The enzyme requires activation by glutathione. It is irreversibly inhibited at pH 3.5 or lower and has maximum activity at about pH 7.4. Temperatures
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