Hong Xu and Maria Eriksdotter (IMAGE) Karolinska Institutet Caption Hong Xu and Maria Eriksdotter, researchers at the Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Sweden. Photo: Ulf Sirborn Credit Ulf Sirborn 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.