Core protein II, QCR2, mitochondrial, Ubiquinol cytochrome c reductase core protein II, UQCR2, Uqcrc2.
This is a component of the ubiquinol-cytochrome c reductase complex (complex III or cytochrome b-c1 complex), which is part of the mitochondrial respiratory chain. The core protein 2 is required for the assembly of the complex.