Abstract
ACCORDING to the classical work of Harrison and his followers1–6, the anteroposterior polarity of amphibian limbs consists of a ‘molecular polarisation’ of the cells which has been acquired by the late gastrula stage of development. I here present evidence that the polarity of the anteroposterior pattern is caused at a later stage of development by a signal emitted from a region posterior to the limb rudiment. In so far as this signal can travel in both directions it is not necessary to postulate any polarity at the cellular level.
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SLACK, J. Determination of polarity in the amphibian limb. Nature 261, 44–46 (1976). https://doi.org/10.1038/261044a0
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DOI: https://doi.org/10.1038/261044a0
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