Emil Karpinski, McMaster University (IMAGE) McMaster University Caption Graduate student Emil Karpinski holds a tibial cross section from a Siberian Woolly Mammoth. This permafrost preserved sample still contains fat entombed marrow. Credit JD Howell, McMaster University 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.