3WN8:
reference: Preferred side-chain conformation of arginine residues in a triple-helical structure., Okuyama K, Haga M, Noguchi K, Tanaka T, Biopolymers. 2014 Oct;101(10):1000-9. doi: 10.1002/bip.22478. PMID: 24615532

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