spongin

A sulfur-containing protein similar to collagen that forms the elastic fibrous structure of certain sponges.

The proper horny or fibrous substance of sponges; ceratose or ceratode. Also spongiolin.

The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.

A horny, sulfur-containing protein related to keratin that forms the skeletal structure of certain classes of sponges proteinaceous compounds of which the spicules in Demospongiae are composed.