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Why small males have big sperm: dimorphic squid sperm linked to alternative mating behaviours

Yoko Iwata*, Paul Shaw, Eiji Fujiwara, Kogiku Shiba, Yasutaka Kakiuchi and Noritaka Hirohashi*

BMC Evolutionary Biology 2011, 11:236  doi:10.1186/1471-2148-11-236

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