4KFM:
reference: X-ray structure of the mammalian GIRK2-betagamma G-protein complex., Whorton MR, MacKinnon R, Nature. 2013 Jun 13;498(7453):190-7. doi: 10.1038/nature12241. Epub 2013 Jun 5. PMID: 23739333

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