3PCO:
reference: Idiosyncrasy and identity in the prokaryotic phe-system: crystal structure of E. coli phenylalanyl-tRNA synthetase complexed with phenylalanine and AMP., Mermershtain I, Finarov I, Klipcan L, Kessler N, Rozenberg H, Safro MG, Protein Sci. 2011 Jan;20(1):160-7. PMID: 21082706

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