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Generalised diagram showing a cross-section of an animal embryo. Mesoderm forms between the ectoderm and endoderm, and becomes the muscles, connective tissues, skeleton, kidneys, circulatory and reproductive organs.

(genetic biology)

Grammar: noun
Definition: the middle germ layer of an embryo, lying between the ectoderm and the endoderm
Example:
1. Pockets form in mesoderm to provide fluid-filled body cavities for organ differentiation.

2. Mesoderm is formed when cells migrate into the fluid-filled center of the blastula, using cell surface integrins to follow railway tracks of fibronectin.
Related Word: mesodermal (adjective)