Gradients of fibroblast growth factors often induce cells to adopt different fates. A study in zebrafish embryos reveals another, unexpected role when the factors are trapped in small spaces by a special arrangement of cells. See Letter p.120
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Sharpe, J. Cells unite by trapping a signal. Nature 515, 41–42 (2014). https://doi.org/10.1038/nature13933
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DOI: https://doi.org/10.1038/nature13933