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Survival rate of RD cells treated with KGS extract. RD cells cultured on 96-well plates were treated with indicated concentrations of KGS extract, then incubated for 24 or 48 hours, followed by MTT assay. Survival rates of cells were calculated as the ratio of OD570−630 nm of treated cells to OD570−630 nm of untreated cells. *P value < 0.05 by Scheffe's test.
