Suppression of haptoglobin and loss of striatal neurons in mice chronically exposed to chlorpyrifos-contaminated drinking water.

Although lethal toxicity was observed only in CPF-exposed animals, the incidence was low and did not reach statistical significance in this cohort.

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Statistical significance was defined as P < 0.05, with marginal significance noted for values between 0.05 and 0.10.

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