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Mesodermal Competence of the Presumptive Ecto-Neuroderm at Various Developmental Stages, in Xenopus laevis (Daudin)

Sri Sudarwati


Abstract. A comparative study on the reactive capacity of the presumptive ecto-neuroderm on mesoderm formation with increase of age has been done in Xenopus Laevis. It was proved that before gastrulation, mesoderm induction mainly produces dorsal mesodermal structures. During the gastrulation process the product of differentiation tends to shift from dorsaL to ventral mesodermal structures. The presumptive ecto-neuroderm has has already a competence for mesoderm formation at the early blastula stage and this competence starts to fade out at the horse-shoe-shaped blastopore stage.

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