Shape-Shifting Virus Shell (1 of 2) (IMAGE) European Molecular Biology Laboratory Caption As a retrovirus matures, the two parts of its shell protein (red and blue or yellow and blue) dramatically rearrange themselves, twisting and moving away from each other. Credit EMBL/T.Bharat Usage Restrictions EMBL press and picture releases including photographs, graphics, movies and videos are copyrighted by EMBL. They may be freely reprinted and distributed for non-commercial use via print, broadcast and electronic media, provided that proper attribution to authors, photographers and designers is made. 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.