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The online version of the original article can be found at 10.1038/scibx.2008.208
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Haas, M. The cross-talking hedgehog. Science-Business eXchange 1, 225 (2008). https://doi.org/10.1038/scibx.2008.225
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DOI: https://doi.org/10.1038/scibx.2008.225