For the analysis of other districts, cells from the hippocampus have low expression levels of TMPRSS2 and ACE2, and the cerebellum, spinal cord, and neuronal epithelium data show zero expression of TMPRSS2 and ACE2 (Supplementary File: Figures S27–S30), which demonstrates a low infection risk of these districts. This evidence concerns the gene TMPRSS2 and infection.