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The Cover Image is a brightfield micrograph with colored filters (magnification 14x) from crystals of influenza virus neuraminidase isolated from terns, by Julie Macklin and Graeme Laver, Australian Natl. Univ., Canberra. Courtesy of Nikon Small World (1st Place 1987 Photomicrography Competition, https://www.nikonsmallworld.com).