3P6B:
reference: Structure of CBM4 from Clostridium thermocellum cellulase K., Alahuhta M, Luo Y, Ding SY, Himmel ME, Lunin VV, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2011 May 1;67(Pt, 5):527-30. Epub 2011 Apr 20. PMID: 21543854

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