Just as the development of technology is a branch of the history of political and economy, so is the evolution of patent law. The claim is well illustrated by the attempts mounted in recent years in the United States and Europe to patent DNA sequences that comprise fragments of human genes. Examination of these efforts reveals a story that is partly familiar: Individuals, companies, and governments have been fighting over the rights to develop potentially lucrative products based on human genes. The battle has turned in large part on whether the grant of such rights would serve a public economic and biotechnological interest. Yet the contest has raised issues that have been, for the most part, historically unfamiliar in patent policy...