Planarian flatworms regenerate their heads and tails after amputation. It turns out that they use Wnt–β-catenin signalling to determine where the head and the tail should form.
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Tanaka, E., Weidinger, G. Heads or tails: can Wnt tell which one is up?. Nat Cell Biol 10, 122–124 (2008). https://doi.org/10.1038/ncb0208-122
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DOI: https://doi.org/10.1038/ncb0208-122
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