• Amphibian Embryology Tutorial - Glossary and graphical illustration of oogenesis, cleavage, gastrulation and neuraltion, primarily in Ambystoma and Xenopus, from the University of Wisconsin, Madison.
• Xenbase - Collection of information on early amphibian development, methods including immunohistochemistry, in situ hybridization, molecular markers, based on Xenopus, as part of the WWW Virtual Library.

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