Cyanophycin biosynthesis in action (IMAGE) McGill University Caption Cyanophycin biosynthesis looks like a windshield wiper in action: one domain is responsible for adding aspartate (Asp), a second domain is responsible for adding arginine (Arg), two nitrogen-rich amino acids, and the third domain holds on to the growing chain of cyanophycin. Credit Schmeing Lab Usage Restrictions None 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.