COXFA4L2 and nonpapillary renal cell carcinoma: Previous studies have suggested that NDUFA4L2 is located in the mitochondria in HeLa and MEFs.11 This, together with our seahorse analysis and the numbers of mitochondrial proteins in the IP-MS (Supplementary Table 2), led us to reason that NDUFA4L2 is located in the mitochondria in ccRCC cells.