6XQN:
reference: Structures reveal gatekeeping of the mitochondrial Ca(2+) uniporter by MICU1-MICU2., Wang C, Jacewicz A, Delgado BD, Baradaran R, Long SB, Elife. 2020 Jul 15;9. pii: 59991. doi: 10.7554/eLife.59991. PMID: 32667285

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