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Gastrulation is an early stage during [[metazoan]] development where the embryo which was previously a hollow ball of cells begins to infold.

Gastrulation is an early stage during [[metazoan]] development where the embryo which was previously a hollow ball of cells begins to infold.

Gastrulations marks a vital stage in development and is much studied by biologists.

Gastrulations marks a vital stage in development and is much studied by [[biology|biologists]].