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ectoderm
One of three so-called germ layers of tissue formed in the early development of a fertilized ovum (egg). It is the outer layer of the blastula and later differentiates, in most animals, into a skin or shell, a nervous system, lining tissue, parts of some sense organs, and various other tissues. Other germ layers are the endoderm and mesoderm.
Related category
• DEVELOPMENTAL BIOLOGY
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