Natural simian virus 40 strains are present in human choroid plexus and ependymoma tumors.
Lednicky JA, Garcea RL, Bergsagel DJ, Butel JS. Natural simian virus 40 strains are present in human choroid plexus and ependymoma tumors. Virology. 1995 Oct 01; 212(2):710-7.