Gr-1 expression on peritoneal lavage neutrophils. Mice received thioglycollate intraperitoneally, and neutrophils were harvested at indicated time points. Cells were stained with Gr-1 (FITC) and assessed by flow cytometry. Results are represented graphically, by geometric mean fluorescent intensity. (○) Represent wild-type neutrophils; (•) represent C/EBPɛ-deficient neutrophils. Significant differences between samples are shown (Mann Whitney U test).