6HUL:
reference: Evolutionary Morphing of Tryptophan Synthase: Functional Mechanisms for the Enzymatic Channeling of Indole., Fleming JR, Schupfner M, Busch F, Basle A, Ehrmann A, Sterner R, Mayans O, J Mol Biol. 2018 Oct 24. pii: S0022-2836(18)30606-5. doi:, 10.1016/j.jmb.2018.10.013. PMID: 30367843

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