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Cytotoxicity of wild-type and mutant hRNase3 to Beas-2B cells. Cytotoxicity of hRNase3 and its HBR mutants to Beas-2B cells were assessed by MTT assay. Cell viability of Beas-2B cells with PBS treatment was set as 100%. Results are presented as mean ± SD (n = 3). **P < 0.01, ***P < 0.005.
