DPP4 and infection: Besides ACE2, other receptors have been describedto contributeto SARS-CoV-2 binding to the host-cell surface and subsequent infection.For this reason, we tested interaction of Sp+VLPs withreported host-cell binding partners neuropilin-1 (CD304),11,12 basigin (CD147),13 DPP4 (CD26),14,15 and TMPRSS216,17 using fBSLBs in combination withflow cytometry (Figures 3, S4, and S5).