Alignment of polypeptide sequences of subunits A and B of the EhV-ATPase. Alignment was performed using the ClustalW program. Identical amino acids are shown in black boxes. Conserved changes are shown in gray boxes. Numbers correspond to amino acid positions in each polypeptide. Arrows indicate primers Bvac-S-373 and Bvac-AS-833 used to amplify by PCR a 465 bp DNA fragment containing a 154 aa region, which is a EhV-ATPaseB specific region.