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Rotenone and paraquat effects on astrocytic trypan blue exclusion. Cells were treated with rotenone for 4 h (a) and 24 h (b) or with paraquat (c) for 4 h and 24 h (d), with varying concentrations as indicated. Cell number refers to the number of trypan blue negative cells. Values are expressed as the mean±SEM. * denotes P<0.05, treated cells compared to control (0).
