2KS4:
reference: 1H, 13C, and 15N NMR assignments of the actinoporin Sticholysin I., Castrillo I, Alegre-Cebollada J, del Pozo AM, Gavilanes JG, Santoro J, Bruix M, Biomol NMR Assign. 2009 Jun;3(1):5-7. Epub 2008 Nov 6. PMID: 19636934

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