Infection of XMRV in Primary Neuronal cell types. A. Progenitors, PDNs, or PDAs are plated on 24-well poly d-lysine coated plates (2.5 × 105 cells/well). XMRV (107 copies/mL) was exposed these cells for two hours. Four days post-infection, XMRV levels were measured from the total RNA. Results are from three independent experiments. B. Infection of XMRV on Neuronal Cells Co-cultured with XMRV-infected Jurkat cells. XMRV-infected Jurkat cells are exposed on the adherent neuronal cells for four hours. The Jurkat cells were washed and the XMRV from the neuronal cells were measured. Results are from three independent experiments.