Figure 1From: Open questions: missing pieces from the immunological jigsaw puzzleCross-presentation of extracellular antigen to a cytotoxic T cell by an activating dendritic cell. Adapted from Figure 4-20 in DeFranco AL, Locksley RM, Robertson M Immunity: The Immune Response in Infectious and Inflammatory Disease. London: New Science Press; 2007.Back to article page