4EDA:
reference: Insight into structural diversity of influenza virus hemagglutinin., Cho KJ, Lee JH, Hong KW, Kim SH, Park Y, Lee JY, Kang S, Kim S, Yang JH, Kim EK, Seok JH, Unzai S, Park SY, Saelens X, Kim CJ, Lee JY, Kang C, Oh HB, Chung MS, Kim KH, J Gen Virol. 2013 May 1. PMID: 23636824

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