3HW9:
reference: Cation-selective Pathway of OmpF Porin Revealed by Anomalous X-ray Diffraction., Dhakshnamoorthy B, Raychaudhury S, Blachowicz L, Roux B, J Mol Biol. 2009 Nov 20. PMID: 19932117

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