S100A9 and infection: Our results showed that H37Rv infection inhibited both PGE2 production (****p < 0.0001, Figure 10L) and Cox-2 expression (Figure 10N, left panel) in WT RAW264.7 cells 12 h post-infection, compared to those in S100A9–/– RAW264.7 cells (Figures 10L,N).