Mutant silkworms could open the way for large scale production of spider silk.

Scientists have been able to create mutant silkworms that produce large amounts of stronger-than-steel spider silk. Spider silk is considered as a superfiber but they are not produced by spiders in large quantities. On the other hand, silkworms have the ability to mass produce silk, so by mixing specific spider genes into silkworm chromosomes, they created caterpillars that can make large threads which are as strong as spider silk.

The scientists said that their study will help create silk threads that can be custom built for flexibility and strength.

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