1R6U:
reference: Functional and crystal structure analysis of active site adaptations of a potent anti-angiogenic human tRNA synthetase., Yang XL, Guo M, Kapoor M, Ewalt KL, Otero FJ, Skene RJ, McRee DE, Schimmel P, Structure. 2007 Jul;15(7):793-805. PMID: 17637340

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