
Mesoglea, also known as mesohyl, is the translucent, non-living, jelly-like substance found between the two epithelial cell layers in the bodies of coelenterates and sponges. The mesoglea is mostly water. Other than water, the mesoglea is composed of several substances including fibrous proteins like collagen and heparan sulphate proteoglycans. Th...
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http://en.wikipedia.org/wiki/Mesoglea

(from the article `circulation`) ...(i.e., its members have two layers of cells). The outer layer, called the ectoderm, and the inner layer, called the endoderm, are separated by an ... ...end attaches to a plant or some other support, and the other end is free and has a mouth surrounded by tentacles. The body wall consists of two ... ...
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http://www.britannica.com/eb/a-z/m/76

A layer of jelly-like material between the external (ectoderm) and internal (endoderm) cellular layers of the body of a sponge or cnidarian. The mesoglea consists largely of collagen-like fibers and mucopolysaccharides. In sponges it contains many motile cells. In cnidarians it may be thin and conta...
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http://www.daviddarling.info/encyclopedia/M/mesoglea.html

A gel-like matrix that occurs between the outer and inner epithelial layers in cnidarians.
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https://www.encyclo.co.uk/local/21571
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