4E2F:
reference: Trapping and structure determination of an intermediate in the allosteric transition of aspartate transcarbamoylase., Guo W, West JM, Dutton AS, Tsuruta H, Kantrowitz ER, Proc Natl Acad Sci U S A. 2012 Apr 30. PMID: 22547808

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