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https://www.ncbi.nlm.nih.gov/Structure/pdb/1I1N 1I1N: HUMAN PROTEIN L-ISOASPARTATE O-METHYLTRANSFERASE WITH S-ADENOSYL HOMOCYSTEINE PROTEIN-L-ISOASPARTATE O-METHYLTRANSFERASES-ADENOSYL-L-HOMOCYSTEINE protein l isoaspartatehuman