Neutrophil infiltration was assessed through immunofluorescent staining of myeloperoxidase positive (MPO+) cells, as an over-exuberant neutrophil response is known to cause epithelial damage in IBD.23 The MF and OO fed diets had the highest number of MPO+ cells, with the MD showing significantly less infiltration than the MF diet (Figure S2). The gene discussed is MPO; the disease is inflammatory bowel disease.