1YGP:
reference: A protein phosphorylation switch at the conserved allosteric site in GP., Lin K, Rath VL, Dai SC, Fletterick RJ, Hwang PK, Science 1996 Sep 13;273(5281):1539-42. PMID: 8703213

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