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A and C, Percentage of rats that showed any seizure behavior at 100 dB noise intensity for females and males (A and C). Percentage of rats that showed clonus seizures at 100 dB noise intensity for females and males (B and D). n = 9 for controls and 8 for polychlorinated biphenyl (PCB)-exposed group for both males and females. * indicates that the 6 mg/kg PCB exposure group significantly differed from the control group (P < .05).
