Medical term:

spongin



spongin

(spŭn′jĭn)
n.
A sulfur-containing protein similar to collagen that forms the elastic fibrous structure of certain sponges.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

spongin

a horny substance secreted by cells in the middle layers of the sponge that acts as a cement joining together the spicules in the body wall or forming a fibrous skeleton in other types.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


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