Fig. 1From: Effects from a 90-day inhalation toxicity study with cerium oxide and barium sulfate nanoparticles in ratsTimeline of test item exposure and sacrifices. Animals were exposed over a time period of 90Â days, followed by a post-exposure period of an additional 90Â days. Clinical examinations were performed after one and 28Â days exposure and after one, 28 and 90Â days post-exposureBack to article page