1U7D:
reference: Crystal structures of apo wild-type M. jannaschii tyrosyl-tRNA synthetase (TyrRS) and an engineered TyrRS specific for O-methyl-L-tyrosine., Zhang Y, Wang L, Schultz PG, Wilson IA, Protein Sci 2005 May;14(5):1340-9. PMID: 15840835

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