Scientists aiming to bring back woolly mammoth create woolly mice – The Guardian

In the research, which has not yet been peer-reviewed, the team used a number of genome editing techniques to either genetically modify fertilised mouse eggs or modify embryonic mouse stem cells and inject them into mouse embryos, before implanting them into surrogates. The team focused on disrupting nine genes associated with hair colour, texture, length or pattern or hair follicles. Most of these genes were selected because they were already known to influence the coats of mice, with the induced disruptions expected to produce physical traits similar to those seen in mammoths, such as golden hair. However, two of the genes targeted in the mice were also found in mammoths, where they are thought to have contributed to a woolly coat, with the changes introduced by the researchers designed to make the mouse genes more mammoth-like.