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Light micrograph of lung tissue of a rat exposed to Pigment A TiO2 particles (5 mg/kg) at 3 months post-instillation exposure. This micrograph illustrates the terminal bronchiole (TB) and corresponding alveolar ducts (AD), and demonstrates normal lung architecture, indicating that exposure to Pigment A TiO2 particles produced no adverse pulmonary effects. Magnification = ×100.
