(B) COS7 cells coexpressing DRP1‐DN and mtDsRed (red) were fixed, permeabilized and stained with a monoclonal antibody against nitrotyrosine (green). Control cells were infected with mtPA‐GFP lentivirus. DRP1‐DN cells show increased nitrotyrosine immunoreactivity in mitochondria, particularly in the distal and enlarged ends. Scale bar, 15 μm (see also Supplementary Figure S9). 