1PBG:
reference: The three-dimensional structure of 6-phospho-beta-galactosidase from Lactococcus lactis., Wiesmann C, Beste G, Hengstenberg W, Schulz GE, Structure 1995 Sep 15;3(9):961-8. PMID: 8535789

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