Prion disease (IMAGE) Scuola Internazionale Superiore di Studi Avanzati Caption Photomicrograph of a neural tissue specimen, harvested from a scrapie affected mouse, revealing the presence of prion protein stained in red. Credit National Institute of Allergy and Infectious Diseases (NIAID) Usage Restrictions Attribution required as follows: Photo courtesy of National Institute of Allergy and Infectious Diseases (NIAID) 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.