2XRM:
reference: Regulation of an intracellular subtilisin protease activity by a short propeptide sequence through an original combined dual mechanism., Gamble M, Kunze G, Dodson EJ, Wilson KS, Jones DD, Proc Natl Acad Sci U S A. 2011 Mar 1;108(9):3536-41. Epub 2011 Feb 9. PMID: 21307308

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