QCR6, or Ubiquinol-cytochrome c reductase hinge protein, is a human gene encoded by UQCRH. It may also be known as: Cytochrome b-c1 complex subunit 6, mitochondrial; Cytochrome c1 non-heme 11 kDa protein; Mitochondrial hinge protein; Ubiquinol-cytochrome c reductase complex 11 kDa protein; Complex III subunit 6; ubiquinol-cytochrome c reductase, complex III subunit VIII; UQCR8. The encoded protein has an amino acid length of 91 and a mass of 10.7 kDa. QCR6 is a member of the UQCRH/QCR6 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Arabidopsis, Zebrafish, Frog, Chicken.