The resulting chimera mouse confirms that single-celled organisms had the biolgical tools to develop specialized cells before the creation of stem cells and the entire animal kingdom.

In a massive breakthrough, scientists created a mouse with the use of ancient genetic tools which are older in comparison to animal life. The researchers took a gene from single-celled lifeforms ...

Scientists have engineered a hybrid mouse with a gene that predates all animal life. The team replaced a single gene in the mouse stem cells with a version from an ancient, single-celled ancestor ...

By introducing ancient genes into mouse cells, the researchers demonstrated an extraordinary continuity of genetic function across hundreds of millions of years of evolution.