3I2T:
reference: ErbB2 resembles an autoinhibited invertebrate epidermal growth factor receptor., Alvarado D, Klein DE, Lemmon MA, Nature. 2009 Sep 10;461(7261):287-91. Epub 2009 Aug 30. PMID: 19718021

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