Cover illustration. Light micrographs of rat lungs exposed to filtered air (A) or ozone and nitrogen dioxide (B-D). Lungs of exposed animals show an increased number of interstitial cells and alveolar macrophages as well as increased MnSOD and TNF|ga antisera labeling in those cells. See the article by Weller, Witschi, and Pinkerton on pp. 452-461.
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