Contents

05 October 2007
Vol 318, Issue 5847

About The Cover

Cover image expansion

COVER Artist's representation of the molecular signaling initiated by cell surface receptors. Four Perspectives in this issue and their associated Connections Maps in Science's STKE highlight pathways that regulate diverse functions--from cell motility and survival to development in mammals, plants, and insects. See the special section beginning on page 61. Illustration: Chris Bickel/Science