Hep C Protein (IMAGE) Scripps Research Institute Caption The Scripps Research Institute team found that a key protein on hepatitis C virus, E2, is exceptionally flexible, helping to explain why scientists have had difficulty targeting it with a vaccine. Credit Illustration by Christina Corbaci and Leopold Kong 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.