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5 D4 l* x4 X* l5 ]) r _Crystal structure of the HhaI DNA methyltransferase complexed with S-adenosyl-L-methionine* _: ^ T. D- b, x http://www.ncbi.nlm.nih.gov/pubmed/8343957 0 c& S) o, f- i4 W" B7 w1 m