4CUB:
reference: Unravelling the Multiple Functions of the Architecturally Intricate Streptococcus pneumoniae beta-galactosidase, BgaA., Singh AK, Pluvinage B, Higgins MA, Dalia AB, Woodiga SA, Flynn M, Lloyd AR, Weiser JN, Stubbs KA, Boraston AB, King SJ, PLoS Pathog. 2014 Sep 11;10(9):e1004364. doi: 10.1371/journal.ppat.1004364., eCollection 2014 Sep. PMID: 25210925

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