3VGI:
reference: Atomic resolution of the crystal structure of the hyperthermophilic family 12 endocellulase and stabilizing role of the DxDxDG calcium-binding motif in Pyrococcus furiosus., Kim HW, Kataoka M, Ishikawa K, FEBS Lett. 2012 Apr 5;586(7):1009-13. Epub 2012 Mar 6. PMID: 22569255

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