Contents

16 March 2010
Vol 3, Issue 113

About The Cover

Cover image expansion

Online Cover This week's issue features a Research Article describing a mathematical approach to narrow down the possible pathways that a cell uses to respond to a stimulus. With this approach, the authors showed that two isoforms of the kinase Raf contribute to activation of extracellular signal–regulated kinase by epidermal growth factor. [Image: Chris Bickel, AAAS]