Interestingly, integrin β7 (Itgb7) expression was upregulated in both F4/80lo infiltrating and F4/80hi resident Mφ during zymosan-induced peritonitis upon mPGES-1 inhibition, and Itgb7 expression was previously associated with adhesion of B-cells48 and multiple myeloma cells49. Here, PTGES is linked to peritonitis.