Linus Girdland-Flink (IMAGE) Stockholm University Caption Linus Girdland-Flink working in the ancient DNA laboratory. To avoid introducing contaminant DNA, ancient DNA researchers dress up in full-body coveralls and face masks. Credit Photo: Karolyn Shindler Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.