3LBF:
reference: Crystal structure of the protein L-isoaspartyl methyltransferase from Escherichia coli., Fang P, Li X, Wang J, Xing L, Gao Y, Niu L, Teng M, Cell Biochem Biophys. 2010 Dec;58(3):163-7. doi: 10.1007/s12013-010-9103-2. PMID: 20857228

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