Researchers at Stanford University genetically altered mice to be able to receive and function with human brain cells.

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

For decades, the idea of growing human tissue inside another species sounded like something that belonged in a science fiction movie. Today, laboratories are exploring a far more practical version of ...

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 ...