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Cell proliferation assay in B-cell lymphoma cell line; (a) Comparison of cell proliferation in B-cell lymphoma cells at 24 h after the treatment with 10 μM methotrexate alone and in combination with 0.2 and 0.4 mM N-acetylcysteine; (b) Comparison of cell proliferation in B-cell lymphoma cells at 24 h after the treatment with 100 μM methotrexate alone and in combination with 0.2 and 0.4 mM N-acetylcysteine
