Alignment of potential ATPase domains of the large terminase subunit from herpesviruses and bacteriophages. Large terminase sequences of DEV(UniProtKB accession code C6ZD26), HSV-1 (P04295), HCMV (P16732), EBV (P03219), bacteriophage T4 (P17312), bacteriophage P7 (Q5XLR0) and bacteriophage HK97 (Q9MCT1) were aligned with the ClastalW2 multiple sequence alignment program. The P7 terminase sequence was adjusted manually for the significant deviation in the distance between the motifs. The putative Walker A motifs of each sequence are underlined and in red and the Walker B motif are in blue. Numbers in brackets are the number of residues omitted.