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Representative histology sections (H&E stain, ×20 magnification, black bar scale of 1 mm in each panel) through (A) larynx level 1 and (B) lungs of a male rat showing accumulation of deposited copper phthalocyanine pigment (dark blue) in respiratory airways and complete obstruction of the larynx during an acute, 4-h exposure to 5.212 mg/L aerosol (Wittmer et al., 2021).
