1ZII:
reference: Crystal structures of a single coiled-coil peptide in two oligomeric states reveal the basis for structural polymorphism., Gonzalez L Jr, Brown RA, Richardson D, Alber T, Nat Struct Biol 1996 Dec;3(12):1002-9. PMID: 8946853

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