6ABK:
reference: Structural Basis for Genetic-Code Expansion with Bulky Lysine Derivatives by an Engineered Pyrrolysyl-tRNA Synthetase., Yanagisawa T, Kuratani M, Seki E, Hino N, Sakamoto K, Yokoyama S, Cell Chem Biol. 2019 Apr 5. pii: S2451-9456(19)30104-7. doi:, 10.1016/j.chembiol.2019.03.008. PMID: 31031143

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