4GCS:
reference: The Binding of Antibiotics in OmpF Porin., Ziervogel BK, Roux B, Structure. 2012 Nov 27. pii: S0969-2126(12)00410-8. doi:, 10.1016/j.str.2012.10.014. PMID: 23201272

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