Mechanisms of Lymphocyte Activation and Immune Regulation X: Innate Immunity is the proceedings of the Xth International Conference on Mechanisms of Lymphocyte Activation and Immune Regulation: Innate Immunity, held February 6-8, 2004 in Newport Beach, California. It is the tenth volume of its kind to appear in the series Advances in Experimental Medicine and Biology. Topics include toll receptors, dendritic cells, NK cells, and complement receptors.