Lena Gunhaga (IMAGE) Umea University Caption Lena Gunhaga, professor at UCMM, Umeå University, Sweden Credit Mattias Pettersson Usage Restrictions Media use 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.