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Effect of aqueous extract of the root bark of Morus alba L. (AMA) on epithelial mucosubstances in trachea of rats exposed to sulfur dioxide. Rats were exposed to sulfur dioxide and effect of orally-administered AMA on epithelial mucosubstances (acidic mucins) in trachea was investigated as described in Materials and Methods (×200; hematoxylin and eosin and periodic acid-Schiff-Alcian Blue staining; blue, mucins).
