There are different sources of fibres which can be genetically engineered for living organisms like the spider.
The fibre silk gotten from spiders are known to be the strongest, toughest materials on the Earth. But recently, engineers has designed amyloid silk hybrid proteins and produced them in engineered bacteria.
Even though these synthetically produced fibres are stronger than Kevlar, they prefer to use Kevlar because a much larger amount of silk might be needed to produce the same effect.
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