On the cover: Hemopexin-null mice are protected from mercury-induced autoimmune disease. The autometallographic silver enhancement shows intense staining of mercury-sulfur nanocrystals in the renal tubules of hemopexin-null mice after treatment with mercuric chloride for 4 weeks. Fagoonee, S., C. Caorsi, M. Giovarelli, M. Stoltenberg, L. Silengo, F. Altruda, G. Camussi, E. Tolosano, B. Bussolati. 2008. Lack of plasma protein hemopexin dampens mercury-induced autoimmune response in mice. J. Immunol. 181: 1937–1947.