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Volume 539 Issue 7627, 3 November 2016

A stylized hand skeleton of the Rosa26Hoxa11/Hoxa11 ; prx1Cre mutant mouse. This mutation results in expression of the Hoxa11 gene in distal limb buds, reminiscent of the expression in fin buds, and triggers the formation of extra-digits. Mosty living tetrapods — the four-legged land vertebrates — have five digits per limb. If this number varies through mutation, it’s always a reduction from the canonical five. But this state, called pentadactyly, wasn’t always so hardwired. The earliest tetrapods had six, seven or even eight digits per limb — a polydactyly seen nowadays only in rare mutations. How did pentadactyly become established? Marie Kmita and colleagues show that mutually exclusive expression of Hoxa11 and Hoxa13 is required for five-digit limbs, that a transcriptional enhancer has evolved in the intron of the Hoxa11 gene, and that its function is required to maintain the pentadactyl state. The authors propose that the evolution of Hoxa11 regulation has contributed to the transition from polydactyly in stem- group (extinct) tetrapods to pentadactyly in extant tetrapods. Cover by Yacine Kherdjemil & Marie Kmita

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  • With prices for renewables dropping, many countries in Africa might leap past dirty forms of energy towards a cleaner future.

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  • Monkeys have been observed pounding stones and unintentionally forming sharp-edged, tool-like fragments. This deliberate breakage raises questions about the evolution of intentional stone modification. See Letter p.85

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  • Shortening of the ends of chromosomes limits a cell's lifespan. Some cancer cells avoid this fate through a mechanism called alternative lengthening of telomeres, molecular details of which have now been defined. See Article p.54

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  • The discovery of a cascade of sound waves across many wavelengths in an ultracold atomic gas advances our understanding of turbulence in fluids governed by quantum mechanics. See Letter p.72

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  • The sounds of words that represent particular meanings are usually thought to vary arbitrarily across languages. However, a large-scale study of languages finds that some associations between sound and meaning are widespread.

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  • Physicists are hunting for a particle called the axion that could solve two major puzzles in fundamental physics. An ambitious study calculates the expected mass of this particle, which might reshape the experimental searches. See Letter p.69 See Clarification p.176

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