Figure 4. Serum S100A8/A9 are mainly derived from neutrophils in children with duodenal ulcer. (A, B) Summary of serum S100A8 (A) and S100A9 (B) expression in culture medium of NCM460 cells after treated with IL-17A/F. (C, D) Summary of serum S100A8 (C) and S100A9 (D) expression in culture medium of neutrophils cells after treatment with IL-17A/F. *P < 0.05 compared with 0 ng/ml.