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. The immunologist argues that these few genes 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. Chaired by Liz Hunt.
