Figure 1: EBV structure and partial map of the genome. The EBV virion comprises a 172 kb linear dsDNA genome inside an icosahedral capsid enclosed by an envelope with viral glycoproteins (gp350) utilized for infection of B cells. The positions of the origins of latent and lytic replication of the viral genome, OriP and OriLyt, respectively, are illustrated in black boxes in the EBV genome map. Selected genes and their relative placement are shown as arrows pointed in the direction of translation [20]. In the latent state, only a few antigens are expressed including EBNA-1, LMP-1, and -2A/B (shown in green). Lytic replication begins with induction of the two early transcription factors (shown in red), which activate early viral promoters generating the initiation complex at OriLyt consisting of 6 viral gene products (illustrated in orange). During lytic cycle, various lytic antigens are expressed (shown in yellow) [20]. Gene products of BMRF-1, BCLF-1, and BALF-4 are depicted as EA/D, p160 VCA, and gp110 VCA, respectively.