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Bronchioloalveolar junction at 112 days postexposure to 30 µg TiO2 NPs. Panel (A) Normal bronchioloalveolar junction in a NS-exposed mouse. Panel (B) Rare NB1 (arrows) and small numbers of infiltrating histiocytes (*) in a NB1-exposed mouse. Panel (C) Rare NB2 (arrows) and small numbers of infiltrating histiocytes (*) in a NB2-exposed mouse. Reference bar is 10 µm.
