Close window Published online: 22 November 2006; | doi:10.1038/news061120-9 Human genome more variable than previously thoughtSurprisingly large segments of DNA found to differ from person to person.Helen Pearson How alike are you and me? About 99.5%Getty Nearly six years after the sequence of the human genome was sketched out, one might assume that researchers had worked out what all that DNA means. But a new investigation has left them wondering just how similar one person's genome is to another's. Geneticists have generally assumed that your string of DNA 'letters' is 99.9% identical to that of your neighbour's, with differences...