NRP1 and infection: In this study, we focused on the expression of the molecular mediators that regulate the SARS-CoV-2 entry into host cells: the ACE2 receptor, that acts as molecular doorway to the virus; the serine protease TMPRSS2, that is employed by SARS-CoV-2 for spike protein priming (9–14); and the NRP1, a SARS-CoV-2 co-receptor, that enhances the ability of SARS-CoV-2 to enter and potentiates the infection in host cells (17, 18).