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Cytotoxicity of K. gracilis leaf extract. RD cells were cultured overnight on 96-well plates. Serial dilutions of K. gracilis leaf extract were added and incubated for 24 and 48 hours, followed by MTT assay. Survival rates of cells were calculated as the ratio of optical density at 570–630 nm (OD570–630) of treated cells to OD570–630 of untreated cells. *P value < 0.05; **P value < 0.01; ***P value < 0.001 by Scheffe's test.
