5IHS:
reference: Periplasmic Cytophaga hutchinsonii endoglucanases are required for use of crystalline cellulose as sole carbon and energy source., Zhu Y, Han L, Hefferon KL, Silvaggi NR, Wilson DB, McBride MJ, Appl Environ Microbiol. 2016 Jun 3. pii: AEM.01298-16. PMID: 27260354

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