Uric Acid Crystals (1 of 2) (IMAGE) Technical University of Munich (TUM) Caption Picture of uric acid crystals: Uric acid forms needle-like crystals which activate the immune system. Credit K. Neumann/TUM Usage Restrictions Free for use in reporting on TU Muenchen, with the copyright noted 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.