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miR-21: A gene of dual regulation in breast cancerZhang, Chunfu; Liu, Kui; Li, Tao; Fang, Jie; Ding, Yanling; Sun, Lingxian; Tu, Tao; Jiang, Xinyi; Du, Shanmei; Hu, Jiabo; Zhu, Wei; Chen, Huabiao; Sun, Xiaochun · International Journal of Oncology · 2015