silk sheets (IMAGE) DOE/Pacific Northwest National Laboratory Caption Atomic force microscope image of silk fibroin uniformly self-assembling on graphene. Credit Image courtesy of James De Yoreo | Pacific Northwest National Laboratory Usage Restrictions No restrictions. License Public Domain 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.