6F0M:
reference: Full mutational mapping of titratable residues helps to identify proton-sensors involved in the control of channel gating in the Gloeobacter violaceus pentameric ligand-gated ion channel., Nemecz A, Hu H, Fourati Z, Van Renterghem C, Delarue M, Corringer PJ, PLoS Biol. 2017 Dec 27;15(12):e2004470. doi: 10.1371/journal.pbio.2004470., eCollection 2017 Dec. PMID: 29281623

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