Friend Virus Budding from T-cell (IMAGE) University of Utah Caption This scanning electron microscope image shows newly formed Friend virus particles, upper right in light blue, budding from an infected white blood cell known as a T-lympocyte. The virus was used in a University of Utah study that suggests how increasing genetic diversity in livestock and in captive-bred endangered species may help protect them from infection. Credit Elizabeth Fischer and Austin Athman, NIH Rocky Mountain Laboratories. Usage Restrictions Credit required. 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.