Biology is often foregrounded in the discussion of human identity. Of particular importance is the preoccupation with origins and personal discovery and the increasing use of racial and ethnic categories in social policy. This volume investigates the ways in which existing social categories are both maintained and transformed at the intersection of the natural (sciences) and the cultural (politics). The contributors include medical researchers, anthropologists, historians of science and sociologists of race relations; together, they explore the new and challenging landscape where biology becomes the stuff of identity.