1UIN:
reference: Crystal structures of threonine synthase from Thermus thermophilus HB8: conformational change, substrate recognition, and mechanism., Omi R, Goto M, Miyahara I, Mizuguchi H, Hayashi H, Kagamiyama H, Hirotsu K, J Biol Chem 2003 Nov 14;278(46):46035-45. Epub 2003 Sep 2. PMID: 12952961

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