Developing organisms still hold many surprises for biologists. For instance, an entirely new 'organizer' — a clump of cells that tells other cells what to do — has been discovered at a very early stage of zebrafish development.
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Niehrs, C. A tale of tails. Nature 424, 375–376 (2003). https://doi.org/10.1038/424375a
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DOI: https://doi.org/10.1038/424375a
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