1. The ethics of medical choices / Jon Elster -- 2. Centralisation and discretionary power: kidney transplantation in France / Nicolas Herpin and Florence Paterson -- 3. Obstacles to sperm donation in France / Nicolas Herpin -- 4. Surgeons under surveillance: dialysis and transplantation in the USA /J. Michael Dennis -- 5. The colour of genes in the USA / J. Michael Dennis -- 6. Donations from the living: are the French and Norwegians altruistic? /Hilde Lorentzen and Florence Paterson -- 7. Three countries, three systems / J. Michael Dennis