NDUFB7 and Wilson disease: Long-Evans Cinnamon rats, used as a model of WD with Cu overload, are characterized by down-regulation of genes involved in mitochondrial electron transport chain functioning, including succinate dehydrogenase complex assembly factor (Sdhaf2) and NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit 7 (Ndufb7) (Lee et al., 2013).