1IQ0:
reference: Structural and mutational studies of the recognition of the arginine tRNA-specific major identity element, A20, by arginyl-tRNA synthetase., Shimada A, Nureki O, Goto M, Takahashi S, Yokoyama S, Proc Natl Acad Sci U S A 2001 Nov 20;98(24):13537-42. PMID: 11698642

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