4B9C:
reference: Fine-structural variance of family 3 carbohydrate-binding modules as extracellular biomass-sensing components of Clostridium thermocellum anti-sigma(I) factors., Yaniv O, Fichman G, Borovok I, Shoham Y, Bayer EA, Lamed R, Shimon LJ, Frolow F, Acta Crystallogr D Biol Crystallogr. 2014 Feb;70(Pt 2):522-34. doi:, 10.1107/S139900471302926X. Epub 2014 Jan 31. PMID: 24531486

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