Photosynthetic Protein System (IMAGE) University of Bristol Caption Proteins from a green plant and a purple bacterium are locked together by a genetically-encoded interface domain (blue/yellow). Credit University of Bristol 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.