Woolly mammoth samples (IMAGE) McMaster University Caption Sina Beleka, a post-doctoral researcher at the McMaster Ancient DNA Centre and co-author of the study examines a sample. Credit Sidney Roth/McMaster University Usage Restrictions None License Original 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.