4I9T:
reference: The cation-pi box is a specific phosphatidylcholine membrane targeting motif., Cheng J, Goldstein R, Gershenson A, Stec B, Roberts MF, J Biol Chem. 2013 May 24;288(21):14863-73. doi: 10.1074/jbc.M113.466532. Epub, 2013 Apr 10. PMID: 23576432

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