Effect of MeHg exposure on thioredoxin reductase (TrxR) activity in cytoplasmic (A) and nuclear (B) extracts and relative expression of mRNA coding thioredoxin reductase 1 (TrxR1) (C) in cerebrum and cerebellum of young female and male mice; n = 5–6; **p <0.01, ***p <0.005, ****p <0.001 vs. Female Control, #p <0.05, ##p<0.001, ####p <0.001 vs. Male Control, &p <0.05, &&&p <0.005 vs. Female MeHg.