2ZCE:
reference: Crystallographic Studies on Multiple Conformational States of Active-site Loops in Pyrrolysyl-tRNA Synthetase., Yanagisawa T, Ishii R, Fukunaga R, Kobayashi T, Sakamoto K, Yokoyama S, J Mol Biol. 2008 Feb 29;. PMID: 18387634

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