Biofilm (IMAGE) University of Washington Caption Arrows on this electron microscope image indicate biofilms, or slime, peeling away from the walls of vascular canals in dinosaur bone. Credit Thomas Kaye Usage Restrictions For news purposes only; credit required. 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.