On the cover: Localization of Listeria monocytogenes (yellow) infected macrophages (cyan) in the T cell (red) area of the periarteriolar lymphoid sheath region of the spleen of IFN-γ^−/− mice 24 h post infection. This region contains "innate" CD8 T cells that provide IFN-γ mediated protection (see Figure 4a). The B cells appear blue. Berg, R. E., E. Crossley, S. Murray, and J. Forman. 2005. Relative contributions of NK and CD8 T cells to IFN-γ mediated innate immune protection against Listeria monocytogenes. J. Immunol. 175: 1751–1757.