The blastula then develops a pore or a hole at one end, called a blastopore. Initially, at least four cell divisions occur, giving rise to sixteen cells, collectively referred to as the morula.

Shared features of blastula and neural crest stem cells evolved at the base of vertebrates. Nature Ecology & Evolution, 2024; DOI: 10.1038/s41559-024-02476-8 ...

The blastula develops a pore at one end, called a blastopore. If that blastopore becomes the mouth of the animal, the animal is a protostome, and if it forms an anus, the animal is a deuterostome.

Current issues are available on the Chicago Journals website: Read the latest issue.Originally published by the Marine Biological Laboratory, The Biological Bulletin seeks to disseminate novel ...

Robert Briggs, Thomas J. King, Transplantation of Living Nuclei from Blastula Cells into Enucleated Frogs' Eggs, Proceedings of the National Academy of Sciences of the United States of America, Vol.