FIG. 1.

Structure of VSV subgenomic replicon and predicted mRNA products. The negative-sense VSV genome is represented diagrammatically. mRNA products are represented by solid lines. The filled arrow represents the oligonucleotide primer used in the primer extension reactions (Fig. 6). This primer anneals within the L gene to positive-sense RNA at positions 10925 to 10908 of the complete VSV genome sequence. I tx unit, inserted transcriptional unit; N/L tx unit, N/L transcriptional unit; Le, leader region; Tr, trailer region.