The 2 States of the Enzyme (IMAGE) Institut Laue-Langevin Caption These images depict x-ray (blue) and neutron (magenta) maps of histidine 52 residue in the two states of the enzyme (left and right). Credit ILL 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.