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Effect of DA on cell viability. Low concentrations of DA (0–50 μm) have no significant effect on cell viability in pure cultures of cortical astrocytes, whereas higher concentrations (100, 500 μm) significantly increased the percentage of cell death. **, p < 0.01; ***, p < 0.001 versus control. All data are expressed as mean ± S.E. (error bars).
