1C9D:
reference: Crystallographic studies of phosphonate-based alpha-reaction transition-state analogues complexed to tryptophan synthase., Sachpatzidis A, Dealwis C, Lubetsky JB, Liang PH, Anderson KS, Lolis E, Biochemistry 1999 Sep 28;38(39):12665-74. PMID: 10504236

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