2L4G:
reference: Shallow boomerang-shaped influenza hemagglutinin G13A mutant structure promotes leaky membrane fusion., Lai AL, Tamm LK, J Biol Chem. 2010 Nov 26;285(48):37467-75. Epub 2010 Sep 8. PMID: 20826788

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