FIG. 3.

Diagram describing the M1L through K2L region of the vaccinia virus genome. From the top down, the drawing shows the identity and class (Fig. 4 to 6) of each gene, the coding sequence with arrows representing transcriptional orientation, the positions of Northern and RNase protection probes, the positions of primers used for RT-PCR (E:2466, experimental primer set, 2,466-bp product; C:862, control primer set, 862-bp product), and an interpretation of the transcriptional analysis in Fig. 4 to 8, showing extended readthrough transcription from the K2L promoter into the M1L gene in a Cts23 infection. E, early; I, intermediate.