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The cover image is a scanning electron micrograph of murine small intestine during infection with the helminth parasite,Heligmosomoides polygyrus. False colouring (purple) highlights the worm, in close contact with mucus and intestinal tissue. The image was taken at day 21 of infection in the upper duodenum. Microscopy by Dr Leandro Lemgruber from the Glasgow Imaging Facility, University of Glasgow, UK.