A tiny cluster of our genes holds the key to how we combat disease, how our brains are wired, how attractive we are, even how likely we are to reproduce. In The Compatibility Gene, one of our foremost immunologists tells the remarkable history of these genes' discovery and the unlocking of their secrets. Davis shows how the compatibility gene is radically transforming our knowledge of the way our bodies work - and is having profound consequences for medical research and ethics. Looking to the future, he considers the startling possibilities of what these wondrous discoveries might mean for you and me.