Add Yahoo as a preferred source to see more of our stories on Google. A white laboratory mouse sits on a human hand inside a lab. The human hands holding the mouse have blue protective gloves on ...

Research into human-animal chimeras could have a therapeutic payoff, but the work brings up thorny ethical questions.

Neuroscientists in the US have successfully adapted mice to have functioning human cells inside their own brains. The researchers hope that potential treatments for psychiatric and neurodevelopmental ...