COX4I1 and small cell lung carcinoma: To functionally assess the role of oxidative phosphorylation, we used a panel of six SCLC cell lines with the highest (DMS53, SHP77, H1688; further termed OXPHOShigh) and lowest (H841, H372, H196; OXPHOSlow) protein expressions of NDUFA5, COX4I1, and COX5B (Supplementary Figure S3).