FIG. 1.

(A) Organization of EIAV open reading frames, with solid black lines indicating regions amplified, cloned, and sequenced. The minimal EIAV Rev-responsive element (RRE; see below) is contained within the S2/gp90 amplified region, which spans nucleotides 5233 to 5589. The rev/gp45 amplified region spans nucleotides 7066 to 7680. (B) The EIAV Rev reporter plasmid pERRE-All contains nucleotides 5280 to 7534. The small shaded area indicates the 57-nucleotide region (nucleotides 5485 to 5540) within ERRE-All that was found to comprise a minimal RRE (6). (C) Representation of the Rev chimeric proviral clones. The shaded area in the overlapping rev/tm region indicates the portion containing Rev variant sequences. Numbering is based on that of Kawakami et al. (21).