3C8G:
reference: The mannitol operon repressor MtlR belongs to a new class of transcription regulators in bacteria., Tan K, Clancy S, Borovilos M, Zhou M, Horer S, Moy S, Volkart LL, Sassoon J, Baumann U, Joachimiak A, J Biol Chem. 2009 Dec 25;284(52):36670-9. Epub 2009 Oct 19. PMID: 19840941

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