Ubiquitin Chain (IMAGE) Goethe University Frankfurt Caption This is a schematic model of two linearly linked ubiquitin molecules. The internal tagging site is marked in black. Credit Koraljka Husnjak using PyMOL software Usage Restrictions None 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.