IL-17RB is expressed exclusively by polyp CD4+ T cells. A and B, Representative staining for T-cell phenotypic markers by polyp, healthy nasal biopsy, and paired peripheral blood cells. C, Expression of phenotypic markers by CD4+ T cells derived from blood and nasal tissue of healthy volunteers (n = 7) or patients with CRSwNP (n = 11; Kruskal-Wallis test with Dunn multiple comparison test). *P < .05, **P < .01, and ***P < .001.