Contents

31 July 2012
Vol 5, Issue 235

About The Cover

Cover image expansion

Online Cover During the month of July, Science Signaling published a series of articles on the topic of lymphocyte regulation. The series culminates this week in a Focus Issue that highlights research and commentary on the mechanisms by which T cells, B cells, and natural killer cells are regulated so that they mount an effective immune response without causing damage to the host. The image shows a collection of immune cells as they circulate through the blood. [Image: Dennis Kunkel Microscopy, Inc.]