1LMS:
reference: Structural model for an alkaline form of ferricytochrome C., Assfalg M, Bertini I, Dolfi A, Turano P, Mauk AG, Rosell FI, Gray HB, J Am Chem Soc 2003 Mar 12;125(10):2913-22. PMID: 12617658

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