Nexia is a world leader in the manufacture of recombinant proteins for extreme performance medical and industrial applications. Silk fibers are composed completely of silk proteins which have made an irreversible transition from a soluble silk protein solution inside the spiders' silk gland into an insoluble fiber outside the spider.
Silk is produced within the silk glands of spiders.
Spiders produce a number of different silks with different mechanical properties for use in spinning webs or forming cocoons. Spider dragline silk is widely recognized as the strongest material known. Spider farming is simply not practical. Unlike silk worms, the spider's territorial and aggressive nature precludes intensive cultivation. Further, it is not the spider cocoon silk that is desired but certain components of the web silk, namely the frame silk.