1AL3:
reference: The structure of the cofactor-binding fragment of the LysR family member, CysB: a familiar fold with a surprising subunit arrangement., Tyrrell R, Verschueren KH, Dodson EJ, Murshudov GN, Addy C, Wilkinson AJ, Structure 1997 Aug 15;5(8):1017-32. PMID: 9309218

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