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Fig. 1. Effects of H2O2 on the motility and viability of L. donovani promastigotes. (A) Percentage motility of cells after exposure to 0.1-8 mM doses of H2O2. (B) Percentage viability of cells after exposure to 0.1-8 mM doses of H2O2. Symbols: X, control without H2O2; +, 0.1 mM H2O2; m, 1 mM H2O2; ., 4 mM H2O2; r, 8 mM H2O2; d, 8 mM H2O2 + catalase; j, 4 mM H2O2 + catalase. The data represents mean ± s.e.m. of four experiments.