FIG. 1.

Sequences and TEs of RS virus GEs. The genomic RNA sequences near each GE of strain A2 are shown (3′ to 5′), with the genes in the same order as in the viral genome. Conserved or nonconserved nucleotides are in bold capital or lowercase letters, respectively, and the U tract is underlined. The 12 to 13 nt of the GEs are numbered, beginning with the first U of the conserved 3′-UCAAU-5′ element as position 1. The total nucleotide length of the IG region is shown in parentheses, along with the first 1 to 2 nt of the IG region. Because the M2 and L genes have no true IG region, the IG length is not applicable (na). The relative TE of each GE, as determined using a plasmid-based RNA replicon system in the presence of M2-1 protein expression (19), is indicated as follows: +, inefficient (15 to 40%); ++, efficient (65 to 80%); or +++, highly efficient (95%).