FHV Spherules Cryo (IMAGE) University of Wisconsin-Madison Caption Pictured is a cryo-electron tomography image of a mitochondrion associated with flock house virus RNA replication spherules. Credit UW-Madison 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.