Per Jensen, Linköping University (IMAGE) Linköping University Caption Per Jensen, professor of ethology at Linköping University, shows how extensive changes in chickens' genome have occurred through epigenetics. Credit Vibeke Mathiesen 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.