3A31:
reference: Two Complementary Enzymes for Threonylation of tRNA in Crenarchaeota: Crystal Structure of Aeropyrum pernix Threonyl-tRNA Synthetase Lacking a cis-Editing Domain., Shimizu S, Juan EC, Sato Y, Miyashita YI, Hoque MM, Suzuki K, Sagara T, Tsunoda M, Sekiguchi T, Dock-Bregeon AC, Moras D, Takenaka A, J Mol Biol. 2009 Sep 15. PMID: 19761773

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