(C-F) WT MEFs (C and E) and Drp1-KO MEFs (D and F) were transduced with Su9-Eos, along with Oma1 shRNAs and ectopic Mfn1. Su9-Eos in the small region of mitochondria (indicated by the asterisks) was photoconverted using a 405-nm laser on confocal microscope. Within 1 s after photoconversion, images were obtained for both photoconverted and unconverted Su9-Eos signals. Images before the photoconversion were also taken to detect background signals. Scale bar, 10 µm. (E and F) To determine the connectivity of mitochondria, the area containing photoconverted Su9-Eos signals was divided by the area containing the photoconverted and unconverted Su9-Eos signals (total mitochondria). Values are average ± SD (n = 30 cells). 