Cytokine involvement in the immune system's response to stress is now very well documented. Cytokine activity has been implicated in a variety of mental and physical diseases, and has been shown to have a significant role in fueling the vicious circle of depression and illness. The first edition of Cytokines: Stress and Immunity pointed out that the immune system does not stand alone, but is profoundly affected by other organ systems, especially the central nervous and the neuroendocrine systems, with cytokines being the common tool of communication. This edition continues on the...