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The effect of streptozotocin on viability of rat pancreatic β cells (RIN-5F). Cells were treated with extract for 12, 24, and 48 h and viability was measured by MTT assay. Control wells were treated with equivalent amount of medium alone. The results showed the mean ± SD from triplicated experiments. *P < 0.05 and **P < 0.01 compared with control group.
