Fig. 2. Time course of SO₄⁼ uptake in human erythrocytes measured in control conditions (10 mM Mg²⁺) or in erythrocytes treated with300 μM H₂O₂ or 10 mM Mg²⁺ + 300 μM H₂O₂ (A); or with 600 μM H₂O₂, or 10 mM Mg²⁺ + 600 μM H₂O₂ (B) or 10 μM DIDS (A,B). Points represent the mean ± SD from at least 5 separate experiments (see Table 1), where n.s. is not significant, *p<0.05 and ***p<0.001 versus control; ^§§p<0.01 versus 300 μM H₂O₂, ^§§§p<0.001 versus 600 μM H₂O₂.