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Genetics: The human conditionWhat does it mean to be human? Of the millions of base-pair differences between humans and chimpanzees that contributed to the evolution of human features since Pan and Homo diverged more than 5 million years ago, which are minor ticks of the evolutionary clock and which are the 'smoking guns' of human evolution? Sean Carroll tackles this big question in the light of 50 years of DNA studies, and the hyperbole that will greet publication of the chimpanzee genome sequence.
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