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Front cover illustration

Green fluorescent protein (GFP)-transgenic Nicotiana benthamiana plants infected systemically with potato virus A (PVA). Expression of GFP and symptoms were photographed under UV illumination (left) and visible light (right). Green fluorescence is due to GFP expressed from the gfp transgene, PVA chimera or both. The areas appearing red under UV light (in the top-most leaf, to the left) correspond to dark-green islands observed under visible light (to the right). Image courtesy Jari P. T. Valkonen, Department of Applied Biology, University of Helsinki, Finland. See the paper by Gammelg�rd et al. in this issue, pp. 2337-2346.