6GOL:
reference: Structure and applications of novel influenza HA tri-stalk protein for evaluation of HA stem-specific immunity., Lu IN, Kirsteina A, Farinelle S, Willieme S, Tars K, Muller CP, Kazaks A, PLoS One. 2018 Sep 27;13(9):e0204776. doi: 10.1371/journal.pone.0204776., eCollection 2018. PMID: 30261065

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