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The complex cell movements that carry those cells whose descendants will form the future internal organs from their largely superficial position in the blastula to approximately their definitive positions inside the animal embryo. Prior to gastrulation, the amphibian embryo relies on RNA molecules pre-loaded into the ooplasm during oogenesis. During gastrulation, however, newly synthesized nuclear gene products are required.

Subjects: Zoology and Animal Sciences — Genetics and Genomics.

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