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Ultrastructural localization of DAB reaction product (polyDAB) in 3T3 cells fixed and stained with osmium after irradiation with blue light (450–490 nm at 6.3 W/cm2) for 40 min. Staining was distributed uniformly within peroxisomes (p in A), whereas it was concentrated in the inner and outer membranes of mitochondria (m in B). Inset in A is ×2 magnification.
