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MTT assay of the S1-iRNA ASCs, the empty-vector-iRNA ASCs and the untreated ASCs. A, Growth curve of the ASCs at passage six. No significant difference was observed between these three groups. B, Growth curve of the ASCs at passage fifteen. Note that the proliferation rate of the S1-iRNA ASCs was significantly higher than those of the other two groups (P<0.05).
