3HE8:
reference: Crystal structure of Clostridium thermocellum ribose-5-phosphate isomerase B reveals properties critical for fast enzyme kinetics., Jung J, Kim JK, Yeom SJ, Ahn YJ, Oh DK, Kang LW, Appl Microbiol Biotechnol. 2011 Apr;90(2):517-27. Epub 2011 Jan 21. PMID: 21253719

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