What is it that defines an animal? The definition provided here, made on the basis of developmental biology, suggests methods for resolving phylogenetic problems.
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Systematic comparison of sea urchin and sea star developmental gene regulatory networks explains how novelty is incorporated in early development
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Slack, J., Holland, P. & Graham, C. The zootype and the phylotypic stage. Nature 361, 490–492 (1993). https://doi.org/10.1038/361490a0
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DOI: https://doi.org/10.1038/361490a0
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