Viral Treadmill (IMAGE) University of California - San Diego Caption Cartoon showing a viral replication factory assembled by some jumbo viruses. Viral DNA replicates inside the nucleus (blue shell). Viral capsids travel to the nucleus along a treadmilling filament. Capsids dock on the nucleus in order to package viral DNA. Credit Pogliano/Villa Labs, UC San Diego Usage Restrictions Must be used in conjunction with Cell paper on viral treadmills. 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.