4A55:
reference: Regulation of lipid binding underlies the activation mechanism of class IA PI3-kinases., Hon WC, Berndt A, Williams RL, Oncogene. 2011 Nov 28. doi: 10.1038/onc.2011.532. PMID: 22120714

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