6DT0:
reference: Cryo-EM structure of a mitochondrial calcium uniporter., Yoo J, Wu M, Yin Y, Herzik MA Jr, Lander GC, Lee SY, Science. 2018 Jun 28. pii: science.aar4056. doi: 10.1126/science.aar4056. PMID: 29954988

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