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The Dynamics of Early Pattern Formation in Amphibian Embryogenesis

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Prior to first cleavage the dorsal/ventral polarity of the amphibian egg is established. That polarity can be altered by ultraviolet irradiation. Although embryos irradiated with low doses of UV apparently develop normally through gastrulation, various defects in neural morphogenesis become apparent. Among these defects are abnormalities in the structure of the notochord. In some embryos the notochord is partially defective, while in others it is completely lacking. Detailed analyses of those embryos with the scanning electron microscope generated novel interpretations concerning the role of the notochord in early pattern formation.


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Affiliations: 1: Program in Cellular, Molecular, and Developmental Biology, Department of Biology, Indiana University, Bloomington, Indiana


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