NRP1 and COVID-19: Previous report has shown that NRP1 is ubiquitously expressed in the brain tissues with especially higher level in hippocampal formation (Davies et al., 2020), its expression was elevated in olfactory epithelial cells from human COVID-19 autopsies (Cantuti-Castelvetri et al., 2020), and moreover, NRP1 can mediate entry of nanoparticles coated with SARS-CoV-2 S peptides into the central nervous system of mice (Cantuti-Castelvetri et al., 2020).