Figure 2From: Antioxidant and cytoprotective activities of Piper betle, Areca catechu, Uncaria gambir and betel quid with and without calcium hydroxide Effects of extracts on human gingival fibroblast cells. Cell viability was determined by MTT assay. Values are expressed as means ± SD (n = 3). *Significant difference at p < 0.05 (t-test).Back to article page