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Philos Trans R Soc Lond B Biol Sci. 2001 Oct 29;356(1414):1655-60.

The ectodermal placodes: a dysfunctional family.

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  • 1MRC Centre for Developmental Neurobiology, Guy's Campus, King's College London, London SE1 9RT, UK.


The ectodermal placodes are focal thickenings of the cranial embryonic ectoderm that contribute extensively to the cranial sensory systems of the vertebrates. The ectodermal placodes have long been thought of as representing a coherent group, which share a developmental and evolutionary history. However, it is now becoming clear that there are substantial differences between the placodes with respect to their early development, their induction and their evolution. Indeed, it is now hard to consider the ectodermal placodes as a single entity. Rather, they fall into a number of distinct classes and it is within each of these that the members share a common development and evolution.

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