Genomic organization of arrayed viruses. Locations and direction of transcription of each open reading frame of the arrayed viral genomes are shown. Red arrows indicate ORFs that were amplified and spotted. White arrows indicate regions that are not represented on the array. The names of each ORF for the herpesviruses are described in Additional file 1. (A) HIV-I, HTLV-I, HTLV-II and HCV; (B) KSHV, EBV, HHV6.