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Deuterostomes (後口動物, koukoudoubutsu) are one of the large groups of animals in the animal kingdom. Echinoderms and chordates belong to this group.
The protostome opening of the embryo is the anus and the opposite opening is the mouth.
The body structure is characterized by the order of digestive organs, circulatory organs, and nervous system from the ventral side.
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