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Leaf variegation in the Arabidopsis var2 mutant lacking FtsH2. Four-week-old wild-type Columbia (Col) and var2 leaves are shown, along with in situ detection of reactive oxygen species (ROS; superoxide radicals) visualized by NBT staining (blue color). The right two images show closeup views of variegated leaves where ROS is confined to green sectors and chloroplasts. Images are from Kato et al. (2009).
