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Survival of leukocytes treated with Tapinanthus globiferus (a) and Zanthoxylum zanthoxyloides (b) for 3 h. Results are expressed as mean ± standard error of the mean, n = 4. H2O2 (2 mM) + azide (1 mM) was used as positive control. #P < 0.001 versus control (Ctrl), *P < 0.05 versus Ctrl. T. globiferus was not cytotoxic to leukocytes at the concentrations tested, while, Z. zanthoxyloides does at the highest concentration
