In mammals, is the three-dimensional body plan ingrained in the egg at or before fertilization? The answer is ‘maybe, but then again maybe not’. Less invasive techniques might help to resolve matters.
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Schatten, G., Donovan, P. Plane talk. Nature 430, 301–302 (2004). https://doi.org/10.1038/430301a
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DOI: https://doi.org/10.1038/430301a
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