scleroprotein - a simple protein found in horny and cartilaginous tissues and in the lens of the eyecollagen - a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling elastin - a fibrous scleroprotein found in elastic tissues such as the walls of arteries gelatin, gelatine - a colorless water-soluble glutinous protein obtained from animal tissues such as bone and skin chondrin - a substance that resembles gelatin and is obtained by boiling cartilage in water ceratin, keratin - a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves simple protein - a protein that yields only amino acids when hydrolyzed |