Amino acid sequence alignments of the GRV, LRV, MXV, and NV putative capsid proteins. Alignments were generated by the Clustal method. The hypervariable region of the GRV sequence is underlined, and residues matching GRV exactly are indicated by dashes. GenBank accession numbers for the sequences used in the alignments are as follows: LRV, X86557; MXV, U22498; and NV, M87661.