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Depending on the species, the blastopore has been reported to become the mouth (protostomy), the anus (deuterostomy), both mouth and anus (amphistomy), or neither (i.e., the blastopore closes).
In protosomes, the blastopore develops into the mouth and the second opening forms the anus. In deuterostomes, the blastopore develops into the anus and the second opening forms the mouth.