(A) INS1 cells were transduced with mtPA‐GFP (green) and stained with TMRE (red). mtPA‐GFP distribution is shown immediately (within 2 min) after photoactivation (area indicated by a dashed square) and in the plateau phase of mtPA‐GFP spreading (45 min). Mitochondria that did not exhibit GFP FI decay (less than 5%) are marked by arrows. Upper scale bar, 10 μm; lower scale bar 5 μm. 