Growth factors regulate cell behaviour, and are kept in check by inhibitors. The structure of a complex of two such proteins shows that they form back-to-back butterflies, with the inhibitor's wings stretching to embrace its partner.
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Wrana, J. On the wings of inhibition. Nature 420, 613–614 (2002). https://doi.org/10.1038/420613a
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DOI: https://doi.org/10.1038/420613a