Fig. 3From: Oral toxicological study of titanium dioxide nanoparticles with a crystallite diameter of 6 nm in ratsRepresentative images of yellowish-brown materials found at the submucosa of the nasal cavity (A) and gastrointestinal tract (B) of male and female F344/DuCrlCrlj rats orally administered titanium dioxide for 28 days. The submucosal particles are indicated using arrows. Scale bar for submucosal particles is 20 μm, while that for others is 50 μmBack to article page