1IIB:
reference: The structure of an energy-coupling protein from bacteria, IIBcellobiose, reveals similarity to eukaryotic protein tyrosine phosphatases., van Montfort RL, Pijning T, Kalk KH, Reizer J, Saier MH Jr, Thunnissen MM, Robillard GT, Dijkstra BW, Structure 1997 Feb 15;5(2):217-25. PMID: 9032081

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