07 August 2007
Vol 2007, Issue 398
  • Contents

About The Cover

Cover image expansion

COVER This week's Focus Issue, published to complement the Science Special Issue on Challenges in Immunology, contains an Editorial Guide, a Review, and two Perspectives that discuss signals that affect the fate and responsiveness of T lymphocytes. The image depicts the activation of a naïve CD4+ T lymphocyte by a dendritic cell and its subsequent expansion and differentiation into a long-lived memory cell. [Image: Preston Huey, AAAS]