Title: Fibrous protein
Content:   Fibrous proteins or scleroproteins are one of the three main classifications of protein structure (alongside globular and membrane proteins). Fibrous proteins are made up of elongated or fibrous polypeptide chains which form filamentous and sheet-like structures. These kind of protein can be distinguished from globular protein by its low solubility in water. The roles of such proteins include protection and structural role by forming connective tissue, tendons, bone matrices, and muscle fiber. Fibrous proteins consist of many superfamilies including keratin, collagen, elastin, and fibrin. Collagen is the most abundant of these proteins which exists in vertebrate connective tissue including tendon, cartilage, and bone.
Title: Fibrous protein
Content:  A fibrous protein forms long protein filaments, which are shaped like rods or wires. Fibrous proteins are structural or storage proteins that are typically inert and water-insoluble. A fibrous protein occurs as an aggregate due to hydrophobic side chains that protrude from the molecule. A fibrous protein's peptide sequence often has limited residues with repeats; these can form unusual secondary structures, such as a collagen helix. The structures often feature cross-links between chains (e.g., cys-cys disulfide bonds between keratin chains). Fibrous proteins tend not to denature as easily as globular proteins. Miroshnikov et al. (1998) are among the researchers who have attempted to synthesize fibrous proteins.
Title: Protein
Content:  Structural proteins confer stiffness and rigidity to otherwise-fluid biological components. Most structural proteins are fibrous proteins; for example, collagen and elastin are critical components of connective tissue such as cartilage, and keratin is found in hard or filamentous structures such as hair, nails, feathers, hooves, and some animal shells. Some globular proteins can also play structural functions, for example, actin and tubulin are globular and soluble as monomers, but polymerize to form long, stiff fibers that make up the cytoskeleton, which allows the cell to maintain its shape and size. Other proteins that serve structural functions are motor proteins such as myosin, kinesin, and dynein, which are capable of generating mechanical forces. These proteins are crucial for cellular motility of single celled organisms and the sperm of many multicellular organisms which reproduce sexually. They also generate the forces exerted by contracting muscles and play essential roles in intracellular transport.
Title: Fibroin
Content:  Fibroin is an insoluble protein present in silk produced by numerous insects, such as the larvae of Bombyx mori, and other moth genera such as Antheraea, Cricula, Samia and Gonometa. Silk in its raw state consists of two main proteins, sericin and fibroin, with a glue-like layer of sericin coating two singular filaments of fibroin called brins. Silk fibroin is considered a β-keratin related to proteins that form hair, skin, nails and connective tissues. The silk worm produces fibroin with three chains, the light, heavy, and the glycoprotein P25. The heavy and light chains are linked by a disulphide bond, and P25 associates with disulphide-linked heavy and light chains by noncovalent interactions. P25 plays an important role in maintaining integrity of the complex. The heavy fibroin protein consists of layers of antiparallel beta sheets. Its primary structure 
Title: Rosenthal fiber
Content:  The fibers are found in astrocytic processes and are thought to be clumped intermediate filament proteins, primarily glial fibrillary acidic protein. Other reported constituents include alphaB crystallin, heat shock protein 27, protein beta-1), ubiquitin, vimentin, plectin, c-Jun, the 20 S proteasome, and synemin.
Title: Sustainable fashion
Content:  Protein fibers originate from animal sources and are made up of protein molecules. The basic elements in these protein molecules being carbon, hydrogen oxygen and nitrogen. Natural protein fibers include: wool, silk, angora, camel, alpaca, llama, vicuna, cashmere, and mohair.
Title: Elastic fiber
Content:  Elastic fibers (or yellow fibers) are an essential component of the extracellular matrix composed of bundles of proteins (elastin) which are produced by a number of different cell types including fibroblasts, endothelial, smooth muscle, and airway epithelial cells. These fibers are able to stretch many times their length, and snap back to their original length when relaxed without loss of energy. Elastic fibers include elastin, elaunin and oxytalan. Elastic tissue is classified as "connective tissue proper". Elastic fibers are formed via elastogenesis, a highly complex process involving several key proteins including fibulin-4, fibulin-5, latent transforming growth factor β binding protein 4, and microfibril associated protein 4   In this process tropoelastin, the soluble monomeric precursor to elastic fibers is produced 
Title: List of proteins
Content: Collagen ; Elastin ; F-spondin ; Pikachurin ; Fibronectin 
Title: Fibril
Content:  Elastin is a fibrous protein common in various soft tissues, like skin, blood vessels and lung tissue. Each monomer connects with each other, forming a 3D network, with ability to endure over 200% strain before deformation. Keratin is a structural protein mainly found in hair, nails, hooves, horns, quills. Basically keratin is formed by polypeptide chains, which coil into α-helices with sulfur cross-links or bond into β-sheets linked by hydrogen bonding. β-keratin, which is tougher than α-conformation, is more common in birds and reptiles.
Title: Broadgilled hagfish
Content:  Biometrics research work has pursued applications of the protein fibres within hagfish slime. Douglas Fudge, then head of the University of Guelph hagfish slime research team, stated that when dried, the fibres within the slime become like silk: very thin and strong. (Fudge is now at Chapman University.) "Hagfish slime is made up of two parts: mucus and tiny fibres, about 15cm long but only a micron wide." These fibres could be a natural, renewable alternative to non-renewable, petroleum-derived fabrics, like nylon and spandex. While no one has yet extracted the proteins to make a spool of hagfish thread, Fudge and his team propose that in the future, these proteins will extracted and made into eco-friendly clothing such as athletic wear; or because of their strength, even bulletproof vests.

Question: name two fibres which are made of proteins?
Answer: feathers.
hair.
wool.
fur.
silk.