| 3D8G: reference: Arginine residues at internal positions in a protein are always charged., Harms MJ, Schlessman JL, Sue GR, Garcia-Moreno E B, Proc Natl Acad Sci U S A. 2011 Nov 22;108(47):18954-9. Epub 2011 Nov 11. PMID: 22080604 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).