A) shows the presence of a >950KDa putative Complex I band in A9 and ND6 mutant 4A cells at 0h after [35]S methionine labeling. The >950KDa band can also be seen in 4A cells at 24 h, while in A9 cells, the assembled Complex I band along with supercomplexes is seen. B) the chase experiment shows the gradual disappearance of the >950KDa Complex I intermediate band in 4A cells over time. C) [35]S labeled pulse chase of wild type A9 cells showing the >950KDa complex at early times and the assembled Complex I, indicated as Complex I*, and supercomplexes at later time point. Complexes III, IV and V are marked for molecular weight reference.