Most of the top 10 cited references in Cluster #0 are basic studies that focused on the origin, development, and maintenance of microglia,39 tissue‐resident macrophages,1, 2, 3, 40, 41 Nr4a1‐dependent Ly6C (low) monocytes,40, 42 or brain myeloid subtypes,43 and their roles during neurodegeneration,43 multiple sclerosis, and experimental autoimmune encephalitis (EAE).44 Here, NR4A1 is linked to multiple sclerosis.