Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Lung tissue staining by PAS was used to observe the secretion of airway mucus in the (A) normal, (B) chronic asthma, (C) dexamethasone and (D) Hyssopus offcinalis L. groups (magnification, ×40). Analysis shows the neutral mucus as purple in the alveolar space and the nucleus as violet. PAS, periodic acid-Schiff.
