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About the Cover


The Hawaiian sepiolid squid Euprymna scolopes uses the luminescence of bacterial symbionts in its nocturnal behavior. This ventral dissection (the squid is ˜3.5 centimeters in length) reveals the light-emitting organ as a complex, bilobed structure in the center of the mantle cavity. Normal light-organ development is initiated by specific strains of Vibrio fischeri. See page 1491. [Photograph by William Ormerod, University of Southern California]


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