Structure of complement (IMAGE) University of Helsinki Caption Structure of complement regulating complex on the surface of Borrelia. Credit Konstantin Kogan, Institute of Biotechnology, University of Helsinki. Usage Restrictions Credit as below. 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.