Contents

24 October 1997
Vol 278, Issue 5338

About The Cover

Increasingly, genes are not being considered in isolation, but as part of functional or evolutionary systems. The tornadoes on the cover and the special chart in this issue were used to symbolize the powerful, sometimes random, forces that generate gene families from individual building blocks. A special section beginning on 601, News stories (564, 568, and 569), an Editorial (555), and Reports (675 and 680) illustrate the evolving nature of the genome project. [Illustration: Steven Keller]