During the process of gastrulation, a special type of cells called vegetal pole, which will become endoderm cells, is completely engulfed by the prospective ectoderm, as these top cells undergo epiboly, where the ectoderm cells divide in a way to form one layer.
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In the early blastula stage of the embryo, Ectodermin mRNA and protein forms a gradient that goes from the animal pole ( highest concentration ) down to the marginal zone ( lowest concentration ) to prevent TGF? and nodal signals that induce mesoderm originating from the vegetal pole.
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Studies on Fundulus demonstrated that the YSL is capable of undergoing epiboly even when the blastoderm has been removed, but that the blastoderm cannot undergo epiboly in the absence of the YSL . In zebrafish, there is a microtubule array in the yolk that extends from the animal to the vegetal pole of the embryo, and that contracts as epiboly progresses.
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