Astbury Leeds Amyloid Protein Structure (IMAGE) University of Leeds Caption A section of a b2m amyloid fibril, with the atomic model for 8 copies of the b2m protein built into the EM density. The fibril is built from two 'protofilaments' that wrap around each other (blue and pink). This section is around 4 billionths of a metre long Credit University of Leeds 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.