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This is the story of a few human genes and how we discovered what these genes do. We each have around 25,000 genes, but the genes in this story are those that vary the most from person to person. These genes--called compatibility genes--are, in effect, a molecular signature that distinguishes each of us as individuals. Davis tells the remarkable story of the discovery of compatibility genes, and how decades of patient scientific inquiry, punctuated with individual strokes of genius, have unraveled their workings. Davis reveals how our compatibility genes fight disease, and how this fight varies in all of us and is unique. The version of these genes that we have inherited determines the extent to which we are susceptible or resistant to a vast range of different illnesses.