Promiscuous Enzymes (image) University of California - San Diego Caption Enzymes are often thought to be specific, catalyzing only one reaction in a cell (left). However, some more promiscuous enzymes have many functions and catalyze many reactions in a cell. This study shows that promiscuous enzymes play a larger part in cell growth than previously thought. Credit Courtesy of Systems Biology Research Group, UC San Diego, Jacobs School of Engineering Usage Restrictions Credit required 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.