Stanford Scientists Create Mice With Half-Human Brains

Stanford Scientists Create Mice With Half-Human Brains Scientists at Stanford University have created mice whose brains are largely built from human cells, a shocking, first-of-its-kind experiment that is raising serious questions about how far researchers should be allowed to go. In a study published Wednesday in Nature, Stanford neuroscientist Sergiu Pașca said the development represents the most extensive integration of human neural tissue into an animal ever achieved. The researchers started by genetically engineering mice so that most of the cells meant to form the cortex and hippocampus died off early in...