In the version of the cover caption initially published, the definitions of the green and blue staining were reversed. Green represents nuclear staining, and blue represents the apical membrane. The error has been corrected in the HTML version of the caption.
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The online version of the original article can be found at 10.1038/nm0515-537d
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Erratum: Error in March 2015 cover caption. Nat Med 21, 537 (2015). https://doi.org/10.1038/nm0515-537d
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DOI: https://doi.org/10.1038/nm0515-537d
