(A) EVD flGAG-POL and spliced shGAG mRNAs are distinguishable using specific PCR primer sets (arrows) for quantification and northern analysis. (35S) Cauliflower Mosaic Virus 35S promoter, (Pr) protease, (IN) integrase, (RT-RNase) reverse-transcriptase-RNase; red squares: stop codons. 