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Sequence comparison between the three endonucleases in this study. Identical residues are shown as white on black, and conservative replacements are black on gray. 1, PleI (GenBank accession no. AF355461); 2, MlyI (GenBank accession no. AF355462); 3, N.BstNBI (GenBank accession no. AF329098). Conserved, negatively charged residues are indicated by circles.
