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- push into the blastocoel
- until the invaginating cells lie in a
- layer right up against the outer layer
- of cells. The new cavity formed by
- invagination is called the archenteron;
- it will become the digestive tract in the
- embryo. The opening to the cavity is
- called the blastopore; it will become the
- anus in the developing fetus. The two
- layers of cells of the gastrula will
- become the three primary germ layers
- in the embryo.
- The process of neurulation begins
- just after gastrulation is complete.
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-