'Hedgehog' Genes at Play
Irish Guardsman Martyn Walters, right, of the 1st Battalion Irish Guards, who is 7 feet 3 inches tall faces the media at Wellington Barracks in central London, when it was revealed that 21-year-old Walters has become the tallest ever member of the Guards in their 362-year history. Scientists have found a cluster of genes, all with the word 'hedgehog' in the name, that play a role in human height.