“…The BamHI-H fragment of MDV, which contains about 3 kbp of IRL, has been completely sequenced and no homology was detected to any other herpesvirus sequences, including the corresponding region of HSV (M. M. Binns, Ross, unpublished data). Also, the MDV and HVT genomes, at 166 kbp and 155 kbp respectively (Ross, 1985), are larger than that of VZV, at 125 kbp (Davison & Scott, 1986a), implying that they may contain additional coding regions.…”