4FE4:
reference: Structures of the Escherichia coli transcription activator and regulator of diauxie, XylR: an AraC DNA-binding family member with a LacI/GalR ligand-binding domain., Ni L, Tonthat NK, Chinnam N, Schumacher MA, Nucleic Acids Res. 2012 Dec 14. PMID: 23241389

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