1MQL:
reference: X-ray structure of the hemagglutinin of a potential H3 avian progenitor of the 1968 Hong Kong pandemic influenza virus., Ha Y, Stevens DJ, Skehel JJ, Wiley DC, Virology 2003 May 10;309(2):209-18. PMID: 12758169

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