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“It all started from an accidental observation,” says Li Zhang, a systems neuroscientist at the Keck School of Medicine of ...

The biotech company Colossal Biosciences has long aspired to bring back the extinct woolly mammoth, which roamed the Northern Hemisphere thousands of years ago, during the last ice age. But for now, ...

“We did not just shove mammoth genes into a mouse. There’s 200 million years of evolutionary divergence between them, and that wouldn’t make any sense” from either a scientific or ethical ...

A team of stem cell scientists successfully spawned mice from two male parents that reached adulthood, a significant step, but they still have to figure out the mechanics of the gene modification.