Figure 1. Oncostatin M was expressed in neutrophils.

Nasal polyp sections were stained for OSM in green and various cell type specific markers as indicated in red; two representative examples from separate patients are shown for each staining strategy. OSM did not co-localize with macrophages (A, B) (n=3) or eosinophils (C,D) (n=5) and had minimal co-localization with mast cells (E,F) (n=6). OSM did co-localize with neutrophils (G,H) (n=10).