Colossal Biosciences genetically engineered a ‘woolly mouse’ with mammoth traits. The milestone could inform human gene therapy.

Using DNA and genomics technologies, scientists have modified the mice to have longer, thicker hair and an altered metabolism expected to allow them to tolerate colder temperatures, Colossal Biosciences said.

While the Colossal Laboratories and Biosciences project to bring back extinct species has been compared to “Jurassic Park”, it has started at a much smaller scale than a T. Rex: woolly mammoth mice.