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Relative microRNA expression levels in HCC and liver control tissues. a MiR-9, (b) miR-21 and (c) miR-224 expression levels in 24 HCC tumors and 11 control liver tissues assessed by real-time RT-PCR analysis. d MiR-9 expression levels in different stages of HCC tumors relative to controls. Data are represented as mean ± SE. ***P < 0.001, in comparison to control
