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Alignment of the amino acid sequences of the transposases of IS26, IS257-3, and IS1216. The extents of the H-HTH putative DNA binding domain and the DDE catalytic domain are marked above the sequences. The completely conserved DDE residues are marked by red letters. Amino acids are indicated as follows: black background, 100% similarity; dark-gray background, 80 to 99% similarity; unshaded letters, less than 79% similarity.
