In The Compatibility Gene, leading scientist Daniel M Davis tells the story of the crucial genes that define our relationships, our health and our individuality. We each possess a similar set of around 25,000 human genes. Yet a tiny, distinctive cluster of these genes plays a disproportionately large part in how our bodies work. These few genes, argues Davis, hold the key to who we are as individuals and our relationship to the world: how we combat disease, how our brains are wired, how attractive we are, even how likely we are to reproduce. The Compatibility Gene follows the remarkable history of these genes' discovery. From the British scientific pioneers who struggled to understand the mysteries of transplants to the Swiss zoologist who devised a new method of assessing potential couples' compatibility based on the smell of worn T-shirts, Davis traces a true scientific revolution in our understanding of the human body: a global adventure spanning some sixty years.