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miR-155 expression was upregulated in osteosarcoma cells following treatment with chemotherapeutic drugs. qPCR analysis showing the relative miR-155 expression to U6 in (A) Saos-2 and (B) MG-63 cells. All the experiments were performed in triplicate. *P<0.05 or **P<0.01, vs. control. miR-155, microRNA-155; qPCR, quantitative polymerase chain reaction.
