2OTC:
reference: Substrate-induced conformational change in a trimeric ornithine transcarbamoylase., Ha Y, McCann MT, Tuchman M, Allewell NM, Proc Natl Acad Sci U S A 1997 Sep 2;94(18):9550-5. PMID: 9275160

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