26 November 1999
Vol 286, Issue 5445

About The Cover

Cover image expansion

COVER Life depends on a supply of energy, which is stored in adenosine triphosphate (ATP). The image shows details of the submicroscopic biological ATP-synthesizing machine (at 5 Å resolution), found in life-forms from microbes to humans. It provides the first glimpse of the rotating molecular motor (the lower cylinder), which uses energy from food to propel ATP synthesis in the spherical head. See page 1700 [Image: D. Stock, A. G. W. Leslie, J. E. Walker]