2HMY:
reference: Structure of a binary complex of HhaI methyltransferase with S-adenosyl-L-methionine formed in the presence of a short non-specific DNA oligonucleotide., O'Gara M, Zhang X, Roberts RJ, Cheng X, J Mol Biol 1999 Mar 26;287(2):201-9. PMID: 10080885

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