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mesoderm
One of three so-called germ layers of tissue formed in the early development of a fertilized ovum (egg). It is the middle layer of the blastula and later gives rise to muscles, bones, blood, connective tissue, the heart and many other internal organs. The mesoderm is not found in sponges and cnidarians. Other germ layers are the endoderm and ectoderm.
Related category
• DEVELOPMENTAL BIOLOGY
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