also found inside certain cells. Collagen has great tensile strength , and is the main component of  fascia ,  cartilage ,  ligaments ,  tendons ,  bone  and skin  [1] [2] . Fratzl, P. Collagen: Structure and Mechanics. Springer, New York, 2008 Buehler, M.J., "Nature designs tough collagen: Explaining the nanostructure of