fibrous protein
constitutes one of the three main types of proteins (alongside globular and membrane proteins). There are many scleroprotein superfamilies including keratin, collagen, elastin, and fibroin
collagen
group of fibrous proteins that occur in vertebrates as the chief constituent of connective tissue fibrils and in bones and yield gelatin and glue upon boiling with water
fibroin
insoluble protein present in silk created by various types of insects and spiders
elastin
protein allowing tissue in the body to resume shape after stretching