4Y1K:
reference: New OprM structure highlighting the nature of the N-terminal anchor., Monlezun L, Phan G, Benabdelhak H, Lascombe MB, Enguene VY, Picard M, Broutin I, Front Microbiol. 2015 Jul 1;6:667. doi: 10.3389/fmicb.2015.00667. eCollection, 2015. PMID: 26191054

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