Human alpha-A-crystallin (IMAGE) Technical University of Munich (TUM) Caption A team of scientists from the Technical University of Munich (TUM) has uncovered the precise structure of the alpha-A-crystallin protein. Human alpha-A-crystallin forms structures of 12, 16 and 20 subunits (from left to right). Two subunits (center, dark and light gray) form a dimer. Credit Christoph Kaiser / TUM 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.