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Glycosaminoglycans (GAG) and collagen content of soft tissue (submucosa and mucosa) normalized by dry weight (average ± standard deviation for all three regions: trachea (T), large bronchi (LB) and small bronchi (SB)). Generally, GAG and DNA content increased from proximal to distal regions (*p<0.001). Conversely, regional differences were not significant (n.s.) for collagen content.
