1LBF:
reference: The catalytic mechanism of indole-3-glycerol phosphate synthase: crystal structures of complexes of the enzyme from Sulfolobus solfataricus with substrate analogue, substrate, and product., Hennig M, Darimont BD, Jansonius JN, Kirschner K, J Mol Biol 2002 Jun 7;319(3):757-66. PMID: 12054868

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