The Correspondence by E. Kowal et al. (Nature 546, 474; 2017) wrongly located the University of Pennsylvania in Pittsburgh instead of Philadelphia.
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The online version of the original article can be found at 10.1038/546474a
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Correction. Nature 548, 158 (2017). https://doi.org/10.1038/548158e
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DOI: https://doi.org/10.1038/548158e
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