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Identification of gelatinolytic enzymes in BALF by SDS-polyacrylamide gel electrophoresis gelatin zymography. Lanes C: Control rats; lanes 3 , 5, and 7: 85% oxygen-exposed animals after 3, 5, and 7 days; left and right lanes: prestained molecular weight standards. Zones of enzymatic activity appear as clear bands over a dark background. Gelatinolytic activity bands were inhibited by EDTA.
