Gradients of signalling molecules dictate where specific cell types form in developing tissues, but how these gradients are set up is much debated. A model proposed 40 years ago by Francis Crick may provide an answer.
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Schier, A., Needleman, D. Rise of the source–sink model. Nature 461, 480–481 (2009). https://doi.org/10.1038/461480a
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DOI: https://doi.org/10.1038/461480a
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