Chloroplast Import Motor (IMAGE) Osaka University Caption The chloroplast import motor was derived from the membrane-bound protease of an endosymbiotic cyanobacterial-like ancestor. Credit Osaka University 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.