6BSB:
reference: High-resolution structure of intramolecularly proteolyzed human mucin-1 SEA domain., Noguera ME, Jakoncic J, Ermacora MR, Biochim Biophys Acta Proteins Proteom. 2020 Mar;1868(3):140361. doi:, 10.1016/j.bbapap.2020.140361. Epub 2020 Jan 7. PMID: 31923589

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