c-Src localizes to the mitochondria. A, 10T1/2 cells co-overexpressing EGFR and c-Src were treated as in Fig. 1, A and B, except cells were immunostained for c-Src. Green, c-Src; red, MitoTracker; yellow, merge of green and red. B, the percentage of cells showing merge of the red and green stains is graphed. Results are expressed as the mean ± S.D. of 2 experiments (50 cells were counted per experiment).