comparison to controls (superoxide dismutase: Pb0.01 in brain,b0.05 in liver, b0.01 in serum; catalase: Pb0.01 in brain, b0.01
in liver, b0.05 in serum; glutathione S-transferase: Pb0.01 in brain, b0.05 in liver, b0.05 in serum; glutathione reductase:
Pb0.02 in brain, b0.02 in liver).