Mouse spleen cells were fixed with 4% PFA for 10min at room temperature, permeabilized with 20% PBST for 20 min at room temperature, and incubated in 5% BSA blocking buffer for 30 min at room temperature. Cells were then stained with S100A8 Polyclonal Antibody, FITC Conjugated（bs-2696R-FITC） at 1:50 dilution in blocking buffer and incubated for 30 min at room temperature, washed twice with 2% BSA in PBS. Acquisitions of 20,000 events were performed. Cells stained with primary antibody (green) and isotype control (orange).