FIG. 1.

Alignment of predicted amino acid sequence of MVV 85/34 (GenBank accession number U64439) and S93 (AF338226) Env precursors. Only the residues of S93 Env not conserved with 85/34 are shown. Dots represent amino acid identity with MVV 85/34 Env, and dash represents a gap introduced into the 85/34 sequence for optimal alignment. The amino acid residue positions are indicated on the right of the alignment. The boundaries of the leader peptide, SU, and TM subunits of the Env precursor are indicated above the alignment. The putative cleavage site between the leader peptide and SU is in the position homologous to the chemically defined amino terminus of CAEV 63 SU (15).