FIG. 3.

Alignment of por nucleotide sequences from female members of 17 sex partnerships. Nucleotides that are identical to the consensus sequence are represented by dots. Dashes indicate alignment gaps. Boxes mark the locations of surface-exposed loops, as predicted by the structural model of Derrick et al. (5a). The por A and B homology group sequences are indicated. Nucleotide substitutions resulting in amino acid replacements are shown in bold type.