Unfortunately, the caption for figure 1 of this article in the June 2017 issue of the European Respiratory Review contained incorrect citation details. The images were provided courtesy of Samuel P. Rowbotham (Boston Children's Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA; and Harvard Stem Cell Institute, Cambridge, MA, USA), and were not reproduced from a previous article in Cell (Lee et al., Cell 2014; 156: 440–455), as stated in the original caption. The article has been corrected and republished online.
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