17 April 2009
Vol 324, Issue 5925

About The Cover

Cover image expansion

COVER Multiphoton laser scanning images showing cortical (top) and medullary (bottom) portions of a mouse inguinal lymph node. Green spheres represent dendritic cell precursors 5 hours after transfer from bone marrow; B cell follicles are shown in blue; blood vessels and T cells are in red. During development, these precursors migrate through the blood to lymphoid tissues where they divide and disperse into the dendritic cell network. See page 392). Image: Gabriel Victora and Tanja Schwickert, the Nussenzweig Laboratory, Rockefeller University