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Lung from mouse 24 h after exposure to air (a) or ZnO_2 (b and c). ZnO exposure lead to desquamation of bronchiolar cells as shown in panel b, and vacuolization and necrosis of Clara cells (c). The deposited dose of Zn_2 in the lower respiratory tract is 0.83 μg. The slide section is representative for effects seen in the group.
