4RXH:
reference: Structure of Importin-alpha from a Filamentous Fungus in Complex with a Classical Nuclear Localization Signal., Bernardes NE, Takeda AA, Dreyer TR, Freitas FZ, Bertolini MC, Fontes MR, PLoS One. 2015 Jun 19;10(6):e0128687. doi: 10.1371/journal.pone.0128687., eCollection 2015. PMID: 26091498

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