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Nanoparticle/fiber count per cm2 of lung tissue. ### P < .001 vs photoreactive anatase (a‐nTiO 2) and inert rutile (r‐nTiO 2) at 6 h and ***P < .001 vs a‐nTiO 2 and r‐nTiO 2 4 wks after the final trans‐tracheal intrapulmonary spraying dose. POT, potassium octatitanate
