Spongin

Spongin, a modified type of collagen protein, forms the fibrous skeleton of most organisms among the phylum Porifera, the sponges. It is secreted by sponge cells known as spongocytes Spongin gives a sponge its flexibility. True spongin is found only in members of the class Demospongiae. Researchers have found over 100,000 types of spongin. Spongin...
Found on http://en.wikipedia.org/wiki/Spongin

spongin

(from the article `sponge`) A few Demospongiae (e.g., Oscarella, Halisarca, and Chondrosia) lack skeletons. One group (Ceractinomorpha) has a type of spongin, which, in certain ...
Found on http://www.britannica.com/eb/a-z/s/143

Spongin

• (n.) The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.
Found on http://thinkexist.com/dictionary/meaning/spongin/

Spongin

Spon'gin noun (Physiol. Chem.) The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.
Found on http://www.encyclo.co.uk/webster/S/170

spongin

proteinacous compound of which the spicules in Demospongiae are composed.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_3.html
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