4CAS:
reference: Structure of a photosynthetic reaction centre determined by serial femtosecond crystallography., Johansson LC, Arnlund D, Katona G, White TA, Barty A, Deponte DP, Shoeman RL, Wickstrand C, Sharma A, Williams GJ, Aquila A, Bogan MJ, Caleman C, Davidsson J, Doak RB, Frank M, Fromme R, Galli L, Grotjohann I, Hunter MS, Kassemeyer S, Kirian RA, Kupitz C, Liang M, Lomb L, Malmerberg E, Martin AV, Messerschmidt M, Nass K, Redecke L, Seibert MM, Sjohamn J, Steinbrener J, Stellato F, Wang D, Wahlgren WY, Weierstall U, Westenhoff S, Zatsepin NA, Boutet S, Spence JC, Schlichting I, Chapman HN, Fromme P, Neutze R, Nat Commun. 2013 Dec 19;4:2911. doi: 10.1038/ncomms3911. PMID: 24352554

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