4JAW:
reference: Crystal structures of a glycoside hydrolase family 20 lacto-N-biosidase from Bifidobacterium bifidum., Ito T, Katayama T, Hattie M, Sakurama H, Wada J, Suzuki R, Ashida H, Wakagi T, Yamamoto K, Stubbs KA, Fushinobu S, J Biol Chem. 2013 Apr 26;288(17):11795-806. doi: 10.1074/jbc.M112.420109. Epub, 2013 Mar 11. PMID: 23479733

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