3C2U:
reference: Structure of the two-subsite beta-d-xylosidase from Selenomonas ruminantium in complex with 1,3-bis[tris(hydroxymethyl)methylamino]propane., Brunzelle JS, Jordan DB, McCaslin DR, Olczak A, Wawrzak Z, Arch Biochem Biophys. 2008 Mar 14;. PMID: 18374656

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).