FHV Replication Spherule Render (image) University of Wisconsin-Madison Share Print E-Mail Caption Pictured is a 3-D rendering of a virus RNA replication spherule. The mitochondrial outer membrane is in dark blue, the spherule membrane in white, the interior spherule RNA density in red, and the spherule crown aperture in light blue. Credit UW-Madison Usage Restrictions None 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.