Wnt signalling molecules are thought to direct the development of an organism by spreading through tissues. But flies grow with almost normal appendages even when their main Wnt protein cannot move. Two scientists discuss the implications of this finding for our understanding of development. See Article p.180
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Morata, G., Struhl, G. Tethered wings. Nature 505, 162–163 (2014). https://doi.org/10.1038/nature12848
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DOI: https://doi.org/10.1038/nature12848
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