2XZ6:
reference: Crystal structures of a cysteine-modified mutant in loop D of acetylcholine binding protein., Brams M, Gay EA, Saez JC, Guskov A, van Elk R, van der Schors RC, Peigneur S, Tytgat J, Strelkov SV, Smit AB, Yakel JL, Ulens C, J Biol Chem. 2010 Nov 29. PMID: 21115477

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