Although expression of neither of the two antiporters, SLC25A12 and 13, was increased in SDH-deficient cells (Fig. 3c and Supplementary 4c and d), protein expression of SLC25A13 was noted as significantly upregulated in SDH-deficient tumours (Fig. 3d and Supplementary Table 2). The gene discussed is SLC25A13; the disease is neoplasm.