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Ive behaviour in male rats.Parameter GROUP Tooth chattering Control Leaded gasoline Unleaded gasoline 1.2 ?0.33 3.7 ?0.63 a* 4 ?0.87 a* Number of aggression events Threat posture 1.1 ?0.31 3.9 ?0.43 a** 3.6 ?0.87 a* Leaping and biting 0.9 ?0.35 3.7 ?0.58 a** 3.4 ?0.70 a* Boxing position 0.8 ?0.25 2.7 ?0.47 a* 3.2 ?0.74 a**Values are expressed as means ?SE a: significantly different from the contro