5HEB:
reference: Origins of Allostery and Evolvability in Proteins: A Case Study., Raman AS, White KI, Ranganathan R, Cell. 2016 Jul 14;166(2):468-80. doi: 10.1016/j.cell.2016.05.047. Epub 2016 Jun, 16. PMID: 27321669

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