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https://www.ncbi.nlm.nih.gov/Structure/pdb/1QNP 1QNP: The 3-d Structure Of A Trichoderma Reesei B-mannanase From Glycoside Hydrolase Family 5 ENDO-1,4-B-D-MANNANASEGlycerin; Propane-1,2,3-triolGlycerolN-Acetyl-D-GlucosamineSulfate Ion