AIF1 and inflammatory bowel disease: Noteworthy, findings on microglia in IBD should be interpreted with caution, as many studies were restricted to the analysis of immunoreactivity for the myeloid cell marker ionized calcium-binding adapter molecule 1 (Iba1) or Iba1+ cell number (Table 1), which do not allow clear distinction of parenchymal microglia from other brain macrophages and blood-derived peripheral myeloid cell subsets.