US start-up Werewool has achieved $3.7 million in seed funding in a round led by venture capitalists Material Impact and Sofinnova Partners.

The company develops plastic-free, naturally coloured and inherently fluorescent “regenerative” fibres by brewing custom-engineered proteins using microbes. It says its patent-pending platform technology can help circumvent use of extractive raw materials and harmful dyestuffs, although it does not currently reveal the composition of its fibres online.

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