4N1Y:
reference: Vestigialization of an allosteric switch: genetic and structural mechanisms for the evolution of constitutive activity in a steroid hormone receptor., Bridgham JT, Keay J, Ortlund EA, Thornton JW, PLoS Genet. 2014 Jan;10(1):e1004058. doi: 10.1371/journal.pgen.1004058. Epub 2014, Jan 9. PMID: 24415950

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