GAD1 and bacterial infectious disease: The microglia cluster (MIG) is annotated with OLR1 and CSF1R, and its genes are enriched in immune response and immune cell activation, phagocytosis, endocytosis, viral and bacterial infection, chemokine signaling, etc. The neuron cluster (NEU) is characterized with uneven expression of GAD1, GAD2, and scarce expression of TH and SLC6A3, hinting at glutaminergic neurons and DaN, respectively.