1JSN:
reference: X-ray structures of H5 avian and H9 swine influenza virus hemagglutinins bound to avian and human receptor analogs., Ha Y, Stevens DJ, Skehel JJ, Wiley DC, Proc Natl Acad Sci U S A 2001 Sep 25;98(20):11181-6. PMID: 11562490

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