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Nature 461, 1026 (22 October 2009) | doi:10.1038/72671026a; Published online 21 October 2009

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Making the paper: Catherine Peichel

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New fish sex chromosome holds key to aggressive mating.

When Catherine Peichel and her colleagues went fishing for genes underlying behavioural evolution in a population of sticklebacks, they were prepared for a long haul. It was worth the wait; the five-plus years of work netted a great catch.