2O4V:
reference: An arginine ladder in OprP mediates phosphate-specific transfer across the outer membrane., Moraes TF, Bains M, Hancock RE, Strynadka NC, Nat Struct Mol Biol. 2007 Jan;14(1):85-7. Epub 2006 Dec 24. PMID: 17187075

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