H&E showing the gradual histologic changes in (A) saline, (B) 80 μM LL-37, (C) 160 μM LL-37, and (D) 320 μM LL-37. Increased inflammatory cell infiltrates (Boxes in D; magnified image), thickness of the lamina propria (LP), and mucus (arrow) are demonstrated in 320 μM LL-37-treated mice. Dotted circles are represented by the magnified images in the bottom panel.