3LPW:
reference: The structure of the FnIII Tandem A77-A78 points to a periodically conserved architecture in the myosin-binding region of titin., Bucher RM, Svergun DI, Muhle-Goll C, Mayans O, J Mol Biol. 2010 Sep 3;401(5):843-53. Epub 2010 Jun 11. PMID: 20542041

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