Effects of WBM leaf extracts against keratinocyte death induced by SNP (A) and menadione (B) treatment. Cells were exposed to either SNP (2 mM) or menadione (50 μM) in the absence (vehicle) or presence of leaf extracts (50–200 μg/mL). Cell viability was determined 24 hours later using MTT assay. Data are presented as the mean ± SD of triplicate determinations. Values with the same letter are not significantly different as determined by Duncan’s multiple range tests.