6FOS:
reference: Structure and function of photosystem I in Cyanidioschyzon merolae., Antoshvili M, Caspy I, Hippler M, Nelson N, Photosynth Res. 2018 Mar 26. pii: 10.1007/s11120-018-0501-4. doi:, 10.1007/s11120-018-0501-4. PMID: 29582227

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