DDR1 expression of eosinophils. (A) Flow cytometry analysis of DDR1 expression on peripheral blood eosinophils from CSS patients, asthma patients, and healthy volunteers (H.V.). (B) Comparison of DDR1 expression level among CSS patients, asthma patients, and healthy volunteers (*P < .001, Bonferroni-Dunn test with 1-way factorial ANOVA). (C) Western blot analysis of total DDR1, DDR1a, and DDR1b in peripheral blood eosinophils from CSS patients, asthma patients, and healthy volunteers. (D) Comparison of total DDR1 and DDR1 isoform amount among CSS patients, asthma patients, and healthy volunteers (*P < .001 when compared with asthma patients and healthy volunteers; **P < .01, Bonferroni-Dunn test with 1-way factorial ANOVA). Error bars indicate standard deviation.