Strong & Tough (IMAGE) Washington University in St. Louis Caption This chart compares the toughness and strength of different natural and recombinant silk fibers. In red is the polymeric amyloid fiber developed in Fuzhong Zhang's lab. Credit Washington University in St. Louis/Jingyao Li Usage Restrictions The image may be used with proper attribution 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.