Some food for thought:
Hempel HA, Burns KH, De Marzo AM, Sfanos KS. “Infection of Xenotransplanted Human Cell Lines by Murine Retroviruses: A Lesson Brought Back to Light by XMRV”, Front Oncol. 2013, http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3683812/
Christine A. Kozak:
Origins of the...