gene, which regulates the ability of the cell to divide. These viruses tend to cause tumors when infection occurs outside of their native hosts or in the case of KSHV, in humans when the host is immunosuppressed due to AIDS, old age, or in the setting of organ transplantation. References External links Virus Pathogen Database and Analysis Resource (ViPR): Herpesviridae Viralzone: Rhadinovirus ICTV Gammaherpesvirinae Virus genera