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Levels of Muc5b in young and old mice. A: level of Muc5b in tracheal tissue from old mice was significantly less than the level in young mice; n = 10 mice/group. B: level of Muc5b in BAL fluid from old mice was also significantly reduced, relative to the young mice; n = 9 young mice; 10 old mice. C: Muc5b levels in submucosal gland tissues were the same in young and old mice; n = 10 mice/group. Data are means ± SE. **P < 0.01, ***P < 0.001.
