Live cell imaging of liver myofibroblasts transfected with the mitochondrial marker Mito-Ds red and then stained using (A) NRB-AF12 or (B) ER-Tr green. Magnification 60x; scale bar 10 μm. (C) Co-localization of NRB-AF12 and ER-Tr within mitochondria is reported as Pearson's coefficient (n ≥ 10).