MSH: A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of SKIN; CONNECTIVE TISSUE; and the organic substance of bones (BONE AND BONES) and teeth (TOOTH).,CSP: principle protein of connective tissue; unusual absence of sulfur aminoacids; unique presence of hydroxyproline is believed to permit a triple helical fibrous structure.,NCI: A fibrous protein found in cartilage and other connective tissue.,NCI: A family of large fibrous proteins that are the main components of connective tissue and are responsible for maintaining tissue structure.