Table 1. Rate constant (min^-1) of SO₄⁼ uptake. Rate constant (min^-1) of SO₄⁼ uptake measured in untreated erythrocytes, in control conditions (Mg²⁺-treated erythrocytes) or in erythrocytes treated with either H₂O₂ at different concentrations (300 and 600 µM) or 10 mM Mg²⁺ + either 300 µM H₂O₂ or 600 µM H₂O₂ or treated with either NEM at different concentrations (0.5, 1 or 2 mM) or 10 mM Mg²⁺ + either 0.5 mM, 1 mM or 2 mM NEM. Time (reciprocal of rate constant, min) needed to reach 63% of SO₄⁼ intracellular concentration saturation is also reported. Data are presented as means ± SD from separate N experiments, where: ***p<0.001 and **p<0.01 versus control; n.s. not significant versus control; ^§§p<0.01 versus 10 mM Mg²⁺ + 300 µM H₂O₂, ^§§§p<0.001 versus 10 mM Mg²⁺ + 600 µM H₂O₂ and °°°p<0.001 versus 0.5 mM, 1 mM or 2 mM NEM respectively