Protease-Protein Brush (IMAGE) University of California - Berkeley Caption The height of the new protein brush, made from the neurofilament-derived proteins, can be precisely controlled with protein-digesting enzymes, or proteases. The protease thrombin, shown at the top, cut the brush superficially at the red cross marks, resulting in a negligible change to the height of the brush. The protease clostripain cut the brush much more deeply at the yellow cross marks and thus had a more measurable effect on height. Credit Schematic by Sanjay Kumar Usage Restrictions All rights reserved. Editorial use only. 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.