TABLE 1 .

Comparison of the two systems used for quantifying the average number of incoming genomes expressed per cell^a

System	Diffusible FPsb	VP26-XFPc
Promoter	Immediate-early CMV promoter	PRV late VP26 promoter
Location of FP genes in genome	In gG gene (US)	Fused to VP26 coding region (UL)
FP used	RFP, YFP and CFP	RFP, GFP, and CFP
Cell localization	Diffuse	Punctate in nucleus

^aA short summary of the major differences between the system used in this article and the system previously used (22). U_S and U_L represent the unique short and unique long regions of the PRV genome, respectively (34).

^bSee reference 22.

^cSee this article.