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. Author manuscript; available in PMC: 2015 Nov 8.
Published in final edited form as: Toxicol Pathol. 2013 Jul 11;42(3):582–590. doi: 10.1177/0192623313493689

Figure 4.

Figure 4

SP-immunoreactive nerves (arrows) in intact or damaged regions of tracheal epithelium (E): (A) SP-IR nerves in the intact epithelium. (B) SP-positive nerves in epithelium adjacent to denuded regions after 346-ppm diacetyl. (C) SP innervation in region of detaching epithelium. (D) SP nerves in attenuated epithelium. (E) Lack of SP-immunoreactive nerves in regions where epithelium was denuded. A few positive nerves are located below the basement membrane (arrow). SP = substance P; SP-IR = SP immunoreactive.