(CNN)Since their discovery, the ancestry of hundreds of mummified bodies buried in boats in an inhospitable desert region of northwest China has puzzled and divided archaeologists.... Their Western looks; felted and woven wool clothing; and the cheese, wheat and millet found in their unusual graves suggested they were long-disticance herders.... However, a new study by Chinese, European and American researchers that analyzed the DNA of these 13 mummies, sequencing their genomes for the first time, has painted a different picture. Their analysis suggested that the remains did not belong to newcomers but a local group descended from an ancient ice...