The average relative expression ratios (). (A) The values of the total genes of the mutant and wt viruses plotted against time. The average level of the transcripts of the mutant virus is lower in the early stage, but higher in the late stage of infection. (B) The values of the different kinetic classes of mutant and wt viruses. In the mutant virus, the L genes are repressed in the early stage of infection, whereas the E gene expressions are enhanced in the late stage of infection.