| 3UTX: reference: Shifting hydrogen bonds may produce flexible transmembrane helices., Cao Z, Bowie JU, Proc Natl Acad Sci U S A. 2012 May 22;109(21):8121-6. Epub 2012 May 7. PMID: 22566663 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).