CasPER Figure (IMAGE) Technical University of Denmark Caption Scientists have invented a new method that allows for flexible engineering of essential and nonessential enzymes without additional engineering. Credit The Novo Nordisk Foundation Center for Biosustainability, DTU 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.