Fig 2.

Absolute quantification of extracellular HERV-Fc1 gag RNA molecule copy numbers in plasma samples from healthy controls and patients with MS. The data are expressed as a median RNA copy number/reaction (1 ml) plus SD. Experimental values were quantified on the basis of the external RNA calibration curve obtained from serial dilutions of plasmid containing the amplicon of interest transcribed in vitro (see Materials and Methods). P values were calculated using the nonparametric Mann-Whitney U test.