Yihai Cao (IMAGE) Karolinska Institutet Caption Yihai Cao, professor Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet 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.