1IC2:
reference: Deciphering the design of the tropomyosin molecule., Brown JH, Kim KH, Jun G, Greenfield NJ, Dominguez R, Volkmann N, Hitchcock-DeGregori SE, Cohen C, Proc Natl Acad Sci U S A 2001 Jul 17;98(15):8496-501. PMID: 11438684

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