Crystallized HincII Protein (image) University of Arizona Share Print E-Mail Caption This is a photograph of crystals of the DNA-snipping protein HincII taken under a microscope. The crystals are iridescent because they refract light. The longest crystal is about one millimeter. Credit Nancy C. Horton, the University of Arizona. Usage Restrictions Restrictions: This photo may only be used to illustrate a story about the research described in the accompanying news release, Share Print E-Mail 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.