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On page 593 of this Opinion article, a citation to a key reference (Flowers. S., Beck, G. R. Jr & Moran, E. Tissue-specific gene targeting by the multiprotein mammalian DREAM complex. J. Biol. Chem 286, 27867–27871 (2011)) was not included. This reference should have been cited at the end of the following sentence: “Perhaps isolation of the DREAM and the BMYB–MuvB complexes from distinct mammalian tissues will reveal functions in addition to cell cycle control130,131”. This has now been corrected online.