2JRD:
reference: Locking the kink in the influenza hemagglutinin fusion domain structure., Lai AL, Tamm LK, J Biol Chem. 2007 Aug 17;282(33):23946-56. Epub 2007 Jun 12. PMID: 17567572

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