4IMV:
reference: Disruption of the Putative Vascular Leak Peptide Sequence in the Stabilized Ricin Vaccine Candidate RTA1-33/44-198., Janosi L, Compton JR, Legler PM, Steele KE, Davis JM, Matyas GR, Millard CB, Toxins (Basel). 2013 Jan 30;5(2):224-48. doi: 10.3390/toxins5020224. PMID: 23364220

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