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Animal, vegetal, dorsal and ventral blastomeres of eight-cell embryos of the urodele Pleurodeles waltlii were isolated and cultured for 15 days. The four animal blastomeres produced vesicles delimited by an irregularly shaped epidermis. In all other explants, the formation of mesodermal structures occurred, which can be interpreted as the result of… (More)
The ventro-lateral amphibian mesoderm is the presumptive area of blood cells, lateral plates and mesenchyme. To these mesodermal derivatives primordial germ cells (PGCs) must be added in the urodeles. Mesoderm and PGCs are formed from ectodermal cap of the gastrula under inductive influence of ventral endoderm. The present study was carried out to… (More)