The Editor-in-Chief of DNA and Cell Biology officially retracts the article entitled, “Let-7a Functions as a Tumor Suppressor in Ewing's Sarcoma Cell Lines Partly by Targeting Cyclin-dependent Kinase 6,” by Zhongzu Zhang, Lu Huang, Zhiming Yu, Xiang Chen, Dong Yang, Ping Zhan, Min Dai, Shanhu Huang, Zhimin Han, and Kai Cao (DNA Cell Biol 33(3):136–147; doi: 10.1089/dna.2013.2179) after discovering alerts on the PubPeer platform1 regarding multiple image duplications between Figures 3, 6, and 7.
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