6TPP:
reference: Structural analysis of the reducing-end xylose-releasing exo-oligoxylanase Rex8A from Paenibacillus barcinonensis BP-23 deciphers its molecular specificity., Jimenez-Ortega E, Valenzuela S, Ramirez-Escudero M, Pastor FJ, Sanz-Aparicio J, FEBS J. 2020 Apr 30. doi: 10.1111/febs.15332. PMID: 32352213

This OCA Structure page
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