5L1X:
reference: Engineering, Structure and Immunogenicity of the Human Metapneumovirus F Protein in the Postfusion Conformation., Mas V, Rodriguez L, Olmedillas E, Cano O, Palomo C, Terron MC, Luque D, Melero JA, McLellan JS, PLoS Pathog. 2016 Sep 9;12(9):e1005859. doi: 10.1371/journal.ppat.1005859., eCollection 2016 Sep. PMID: 27611367

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