Fig. 6. TH9 cells are evident in human psoriatic lesional skin.
(A–C) Two color immunofluorescence staining was performed on lesional psoriatic skin. A population of IL-9 producing cells expressed (A) CD3, (B) CD4, and (C) lacked expression of CD8. (D, E) IL-9 production was observed in cells undergoing cell division. (F) A population of CD3− IL-9 producing cells was also present in psoriatic skin lesions. Scale bars=10 μM.