NRP1 and COVID-19: In light of the widely reported disturbance of olfaction in a large fraction of COVID-19 patients (20, 21) and the enrichment of NRPs in the olfactory epithelium, we analyzed a series of autopsies from six COVID-19 patients and eight noninfected control patients to determine whether SARS-CoV-2 could infect NRP1-positive cells (Fig. 4 and table S1).