FIG. 4.

Gene expression patterns of viral strains with MT tyrosine mutations. See the legend for Fig. 2 for further information. Lanes 1 to 4 were also shown in Fig. 2. Doses of input virus genomes were verified by Southern blotting analysis (see Fig. 7, below). The exposure of the blot with the 48-hpi samples was shorter than that for the 24-hpi blot. Different arrangements of the samples were chosen to display the 24- and 48-hpi samples. In panel A, alternating the results for samples with and without serum highlights the serum effect on MT migration.