Second, and more interesting, the oxidative phosphorylation chain, including seven genes (ATP5C1, ATP6AP1, ATP6V1H, COX5B, COX6B1, NDUFA1, and UQCRC1) (Figure S1), five of them shared with Huntington's and Parkinson's disease KEGG categories. Here, ATP6AP1 is linked to Parkinson disease.