4YCZ:
reference: Atomic structure of the Y complex of the nuclear pore., Kelley K, Knockenhauer KE, Kabachinski G, Schwartz TU, Nat Struct Mol Biol. 2015 Mar 30. doi: 10.1038/nsmb.2998. PMID: 25822992

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