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Biochemical factors contributing to response variation in five clones of Daphnia magna exposed to ethyl parathion were studied. Differences in sensitivities to ethyl parathion between sensitive and resistant clones varied between four- and ninefold. Acute toxicity and in vivo acetylcholinesterase (AChE) inhibition responses to ethyl parathion were similar, whereas in vitro AChE sensitivities to paraoxon...
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