4V1R:
reference: Structure of the GH76 alpha-mannanase homolog, BT2949, from the gut symbiont Bacteroides thetaiotaomicron., Thompson AJ, Cuskin F, Spears RJ, Dabin J, Turkenburg JP, Gilbert HJ, Davies GJ, Acta Crystallogr D Biol Crystallogr. 2015 Feb;71(Pt 2):408-15. doi:, 10.1107/S1399004714026443. Epub 2015 Jan 23. PMID: 25664752

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