5NPI:
reference: Conformational Flexibility in the Immunoglobulin-Like Domain of the Hepatitis C Virus Glycoprotein E2., Vasiliauskaite I, Owsianka A, England P, Khan AG, Cole S, Bankwitz D, Foung SKH, Pietschmann T, Marcotrigiano J, Rey FA, Patel AH, Krey T, MBio. 2017 May 16;8(3). pii: e00382-17. doi: 10.1128/mBio.00382-17. PMID: 28512091

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