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Images from storage phosphor screens exposed for 67 d to PVDF membranes containing airway epithelial cell proteins from rats exposed to ozone for 90 d followed by a single intraperitoneal injection of 50 mg/kg 14C-1-NN (Exposure Group 2). The 14 spots that were selected for identification are circled. Three different pH ranges were used to achieve maximum selectivity and sensitivity, but since no 14C activity was detected in the basic range (pH 6–9), this image is not shown.
