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Cover Figure


COVER A Chihuahua walking with a Great Dane more than 50 times its mass. The extreme diversity in body size among purebred dogs is greater than that of any other mammalian species. Researchers have identified a gene that helps explain this size diversity. See page 112 . Photo: Deanne Fitzmaurice

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Science. ISSN 0036-8075 (print), 1095-9203 (online)