Silk fibre is made up of a _______________
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The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons.
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Most spiders make a natural fibre of their own that is also called silk. Silk that is made by the silk worm is made up of two main proteins, sericin and fibroin . Fibroin is the structural center of the silk and gives it its strength. It is made up of amino acids, which make the fibers strong and hard to break.
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