MUC5AC and hyperplasia: In mice, cell proliferation activity was notably higher from day 1 p.i. (BrdU index p = 0.000), day 2 (Hyperplasia p = 0.002, BrdU index p = 0.000, GCM total p = 0.028), day 7 (GCM total p = 0.014), and day 14 p.i. (GCM total p = 0.000), with prominent acid mucin (GCM acid mucin p = 0.000).