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Representative morphologic evaluation of the trachea in different groups. (A) Morphologic gross manifestation of the trachea in different groups. (B) Histologic evaluation of the trachea in different groups by HE staining and Masson staining. (C) Comparison of LP thickness in different groups in HE staining. Values are expressed as the mean ± SEM (n = 5 rabbits/group). ***P < 0.001 and ****P < 0.0001. HE: hematoxylin and eosin; LP: lamina propria; SEM: standard error of the mean.
